RCS – Registered Cardiac Sonographer (CCI) — Questions and Answers

Question 1: In the evaluation of a bioprosthetic aortic valve, which of the following Doppler findings is most suggestive of significant prosthetic valve stenosis?

Triangular, early-peaking CW Doppler profile
Acceleration time (AT) > 100 ms (Correct answer)
Doppler Velocity Index (DVI) of 0.5
Peak velocity of 2.5 m/s

Correct answer: Acceleration time (AT) > 100 ms

An acceleration time (AT) greater than 100 ms, along with a more rounded, late-peaking CW Doppler profile, is a strong indicator of prosthetic aortic valve stenosis. While peak velocities are often increased in normally functioning prosthetic valves, an AT >100 ms is more specific for obstruction. A DVI < 0.25 is indicative of stenosis; 0.5 is normal. A triangular, early-peaking profile is characteristic of a non-stenotic valve.

Question 2: A duplex scan shows the popliteal artery has a PSV of 180 cm/s with post-stenotic turbulence. The adjacent normal segment PSV is 60 cm/s. What stenosis category does this represent?

50–74% stenosis (Correct answer)
Normal
75–99% stenosis
Less than 50% stenosis

Correct answer: 50–74% stenosis

A PSV ratio of 3.0 (180/60) with post-stenotic turbulence classifies the lesion as 50–74% stenosis.

Question 3: When assessing a patient for mitral valve prolapse (MVP) using 2D echocardiography, which view is considered essential for minimizing false positives and confirming the diagnosis?

Parasternal short-axis
Apical four-chamber
Parasternal long-axis (Correct answer)
Subcostal

Correct answer: Parasternal long-axis

The parasternal long-axis view is crucial for diagnosing mitral valve prolapse. This view avoids the saddle-shape of the mitral annulus which can cause a false positive appearance of prolapse in the apical four-chamber view. True MVP is defined as systolic displacement of one or both mitral leaflets >2 mm above the mitral annular plane in the parasternal long-axis view.

Question 4: Holodiastolic flow reversal in the descending thoracic aorta by pulsed Doppler is most consistent with which severity of aortic regurgitation?

Pulmonary regurgitation
Mild aortic regurgitation
Moderate aortic regurgitation
Severe aortic regurgitation (Correct answer)

Correct answer: Severe aortic regurgitation

Holodiastolic reversal throughout the descending thoracic aorta (EDV/PSV ratio >0.2) reflects a large regurgitant volume returning to the LV throughout diastole, a hallmark of severe AR.

Question 5: Which stress testing parameter is most predictive of cardiac mortality independent of angiographic findings?

Exercise capacity in METs (Correct answer)
Peak heart rate achieved
ST segment morphology at peak exercise
Systolic blood pressure response at peak exercise

Correct answer: Exercise capacity in METs

Exercise capacity measured in METs is one of the strongest independent predictors of cardiac and all-cause mortality across multiple studies.

Question 6: Which Doppler equation component must the sonographer manually align to minimize velocity measurement error?

Wall filter setting
Doppler angle (θ) (Correct answer)
Pulse repetition frequency
Sample volume depth

Correct answer: Doppler angle (θ)

Velocity = (Doppler shift × c) / (2 × frequency × cos θ); the angle θ must be estimated and corrected by the operator to calculate true velocity.

Question 7: Which echocardiographic feature differentiates rheumatic aortic regurgitation from aortic root dilation-related AR?

Shorter pressure half-time in rheumatic AR
Leaflet thickening and restricted motion at the tips versus normal leaflet morphology with diastolic coaptation failure (Correct answer)
Central regurgitant jet versus eccentric jet
Holodiastolic flow reversal in the descending aorta in rheumatic versus absence in root dilation

Correct answer: Leaflet thickening and restricted motion at the tips versus normal leaflet morphology with diastolic coaptation failure

Rheumatic AR shows thickened, retracted leaflets with restricted motion causing coaptation failure at the tips, while aortic root dilation causes AR by stretching apart otherwise normal leaflets.

Question 8: The PISA (proximal isovelocity surface area) method assumes that the convergence zone proximal to a regurgitant orifice has what geometric shape?

Hemispheric shell (Correct answer)
Ellipsoid
Flat disk
Cylindrical tube

Correct answer: Hemispheric shell

PISA assumes that blood converges toward a regurgitant orifice in concentric hemispheric shells of equal velocity, allowing flow rate calculation as 2π × r² × aliasing velocity.

Question 9: The 'dead zone' near-field artifact is caused by:

Side lobes creating false echoes
High gain settings
Transducer ringing after pulse transmission that obscures shallow structures (Correct answer)
Refraction at tissue interfaces

Correct answer: Transducer ringing after pulse transmission that obscures shallow structures

After each transmitted pulse, the transducer crystals continue to vibrate briefly (ring-down), masking echoes from very shallow structures during this dead zone period.

Question 10: Which waveform characteristic is MOST indicative of a high-grade internal carotid artery stenosis (>70%)?

Increased peak systolic velocity with spectral broadening (Correct answer)
Decreased peak systolic velocity with a sharp systolic peak
Monophasic low-resistance waveform at the common carotid artery
Absent diastolic flow in the vertebral artery

Correct answer: Increased peak systolic velocity with spectral broadening

High-grade ICA stenosis produces markedly elevated PSV with turbulent post-stenotic spectral broadening due to disturbed flow.

Question 11: The axial resolution of an ultrasound system is best improved by:

Decreasing transducer frequency
Increasing gain
Shortening pulse duration (using higher frequency or damped transducers) (Correct answer)
Widening the sector angle

Correct answer: Shortening pulse duration (using higher frequency or damped transducers)

Axial resolution = spatial pulse length / 2; shorter pulses achieved with higher frequencies or heavy damping allow discrimination of closely spaced objects along the beam axis.

Question 12: In a patient with aortic regurgitation, which echocardiographic measurement is most predictive of the need for surgical intervention?

Left ventricular end-diastolic diameter >55 mm
Vena contracta width >4 mm
Left ventricular end-systolic diameter >50 mm (Correct answer)
Regurgitant fraction >30%

Correct answer: Left ventricular end-systolic diameter >50 mm

An LV end-systolic diameter greater than 50 mm (or indexed >25 mm/m²) is a Class I indication for surgery in asymptomatic severe aortic regurgitation per ACC/AHA guidelines.

Question 13: Which waveform pattern is expected at the common femoral artery in a normal, resting adult patient?

Triphasic with reverse flow component (Correct answer)
Biphasic with no reverse flow component
Monophasic low-resistance
Continuous forward flow

Correct answer: Triphasic with reverse flow component

The normal resting common femoral artery waveform is triphasic with a reverse flow component during early diastole.

Question 14: In color flow Doppler, the variance map (green) indicates:

High velocity laminar flow
Retrograde flow only
Turbulent or disturbed flow (Correct answer)
Absence of flow

Correct answer: Turbulent or disturbed flow

Green color or color variance in the color flow map indicates turbulent or disturbed flow with multiple velocities present within the sample volume.

Question 15: The Doppler shift frequency is directly proportional to which of the following?

The depth of the sample volume
The pulse repetition frequency only
The velocity of the moving reflector (blood cells) (Correct answer)
The wall filter cutoff

Correct answer: The velocity of the moving reflector (blood cells)

The Doppler equation shows that Doppler shift = (2 × f × v × cos θ) / c; shift is directly proportional to velocity of the reflector.

Question 16: If a patient's heart rate is 160, it would be considered which of the following?

Fibrillation
Tachycardia (Correct answer)
Asystole
Bradycardia

Correct answer: Tachycardia

Explanation: <br> Tachycardia refers to a heart rate that is faster than normal. A heart rate of 160 beats per minute would be considered tachycardia, indicating a rapid heartbeat. Bradycardia is a slow heart rate, fibrillation refers to chaotic and irregular heartbeats, and asystole refers to the absence of any heartbeat.

Question 17: A patient with mitral regurgitation will show a prominent 'V wave' on the pulmonary artery wedge pressure tracing. This V wave represents:

Passive left atrial filling against a closed mitral valve during ventricular systole (Correct answer)
Right ventricular systole
Left ventricular isovolumetric relaxation
Aortic valve closure

Correct answer: Passive left atrial filling against a closed mitral valve during ventricular systole

V waves occur during ventricular systole when regurgitant flow from the LV rapidly fills the LA, generating a high-pressure wave visible on the wedge tracing.

Question 18: In two-dimensional echocardiography, which method of calculating LVEF traces the endocardial border in two orthogonal apical views?

Devereux formula
Quinones method
Simpson's biplane method of discs (Correct answer)
Teichholz formula

Correct answer: Simpson's biplane method of discs

Simpson's biplane method of discs traces the endocardial border in the apical four-chamber and two-chamber views to calculate LV volumes and ejection fraction.

Question 19: A patient's ECG shows a long RP tachycardia with inverted P waves in leads II, III, and aVF. Which arrhythmia should be suspected?

Atrial tachycardia from the right atrium
AV nodal reentrant tachycardia (AVNRT)
Sinus tachycardia
Permanent junctional reciprocating tachycardia (PJRT) (Correct answer)

Correct answer: Permanent junctional reciprocating tachycardia (PJRT)

PJRT is a long RP tachycardia with inverted inferior P waves caused by a slowly conducting, decremental accessory pathway.

Question 20: Which great vessel arises from the right ventricle and carries deoxygenated blood?

Pulmonary vein
Aorta
Pulmonary artery (Correct answer)
Superior vena cava

Correct answer: Pulmonary artery

The pulmonary artery (main pulmonary trunk) originates from the right ventricular outflow tract and carries deoxygenated blood to the lungs for gas exchange.

Question 21: The speed of sound in soft tissue is approximately:

340 m/s
1,540 m/s (Correct answer)
3,500 m/s
330 m/s

Correct answer: 1,540 m/s

Ultrasound machines assume a constant propagation speed of 1,540 m/s in soft tissue to calculate depth from echo return time.

Question 22: A patient presents with hypotension, jugular venous distension, and muffled heart sounds. The echocardiogram shows right ventricular diastolic collapse. What is the diagnosis?

Cardiac tamponade (Correct answer)
Acute pulmonary embolism
Tension pneumothorax
Constrictive pericarditis

Correct answer: Cardiac tamponade

Right atrial systolic collapse and RV diastolic collapse are the most specific echocardiographic signs of hemodynamically significant cardiac tamponade.

Question 23: Which finding on intraoperative transesophageal echocardiography (TEE) after mitral valve repair would prompt the surgeon to return to bypass for revision?

Residual mitral regurgitation >2+ (moderate or greater) (Correct answer)
Trivial residual MR on color Doppler
Left ventricular EF of 55% post-bypass
Mean mitral gradient of 3 mmHg post-repair

Correct answer: Residual mitral regurgitation >2+ (moderate or greater)

Residual MR of moderate or greater severity (>2+) after mitral repair is an indication to return to cardiopulmonary bypass for revision, as significant residual MR predicts early repair failure.

Question 24: Which maneuver is MOST effective for demonstrating reflux in the small saphenous vein (SSV) at the popliteal fossa?

Calf compression and release while patient stands (Correct answer)
Proximal thigh tourniquet application
Distal foot compression only
Patient performs 10 calf raises

Correct answer: Calf compression and release while patient stands

Calf compression with rapid release in the standing patient creates the pressure reversal needed to demonstrate SSV valve incompetence at the popliteal level.

Question 25: Which finding is most consistent with popliteal artery entrapment syndrome in a young athlete?

High-thigh to above-knee pressure gradient at rest
Absent waveforms at rest bilaterally
Diffuse calcification throughout the popliteal artery
ABI dropping with plantar flexion or dorsiflexion maneuvers (Correct answer)

Correct answer: ABI dropping with plantar flexion or dorsiflexion maneuvers

Popliteal artery entrapment causes dynamic compression during muscle contraction, detected by ABI or waveform changes with provocative foot maneuvers.

Question 26: Systolic anterior motion (SAM) of the mitral valve leaflet in hypertrophic obstructive cardiomyopathy (HOCM) causes which valvular complication?

Dynamic left ventricular outflow tract obstruction with associated mitral regurgitation (Correct answer)
Aortic regurgitation
Pulmonic stenosis
Mitral stenosis

Correct answer: Dynamic left ventricular outflow tract obstruction with associated mitral regurgitation

SAM pulls the anterior mitral leaflet into the LVOT during systole, creating dynamic obstruction and an associated posteriorly directed MR jet.

Question 27: During coronary angiography, the left anterior descending artery is best visualized in which projection to assess the mid-vessel without foreshortening?

LAO cranial (spider view)
AP cranial projection
RAO caudal (spider view)
RAO cranial projection (Correct answer)

Correct answer: RAO cranial projection

The RAO cranial projection optimally profiles the mid-LAD by elongating the vessel and separating it from overlapping diagonal branches.

Question 28: During a nuclear stress test using regadenoson, a patient develops a new fixed perfusion defect compared to rest images. What does a fixed defect most likely represent?

Normal variant artifact from diaphragmatic attenuation
Prior myocardial infarction with scar tissue (Correct answer)
Hibernating myocardium with potential for recovery
Reversible ischemia in the territory of a stenotic artery

Correct answer: Prior myocardial infarction with scar tissue

A fixed (non-reversible) perfusion defect present on both stress and rest images indicates infarcted, non-viable myocardium.

Question 29: Which Doppler modality uses a sample volume placed at a fixed depth and provides spectral analysis of flow at that specific location?

Color flow Doppler
Continuous wave Doppler
Pulsed wave Doppler (Correct answer)
Tissue Doppler imaging

Correct answer: Pulsed wave Doppler

Pulsed wave Doppler uses a sample volume at a specific depth with range resolution, allowing interrogation of flow at a precise location but limited by the Nyquist limit.

Question 30: In the Doppler equation (Δf = 2 * v * f * cos(θ) / c), what does the cosine of the angle (cos(θ)) represent?

The velocity of the sound wave in tissue.
The operating frequency of the transducer.
The relationship between the angle of the ultrasound beam and the direction of blood flow. (Correct answer)
The angle of incidence between the sound beam and the tissue interface.

Correct answer: The relationship between the angle of the ultrasound beam and the direction of blood flow.

The cosine of the angle (θ) in the Doppler equation accounts for the fact that the most accurate velocity measurement is obtained when the ultrasound beam is perfectly parallel to the direction of blood flow (an angle of 0 degrees, where cos(0)=1). As the angle increases towards 90 degrees, the cosine of the angle approaches zero, and the calculated velocity becomes less accurate, eventually becoming zero at 90 degrees.

Question 31: What artifact occurs when a strong reflector causes repeated echo returns at equally spaced intervals?

Side lobe artifact
Reverberation artifact (Correct answer)
Mirror image artifact
Acoustic shadowing

Correct answer: Reverberation artifact

Reverberation artifacts occur when sound bounces repeatedly between two strong reflectors, creating equally spaced false echoes at multiples of the true depth.

Question 32: In a patient with severe mitral regurgitation, which finding on color Doppler indicates a proximal isovelocity surface area (PISA) radius appropriate for calculating effective regurgitant orifice area?

An eccentric jet impinging on the posterior left atrial wall
A hemispheric flow convergence zone proximal to the mitral valve (Correct answer)
Vena contracta width >7 mm
Pulmonary vein systolic flow reversal

Correct answer: A hemispheric flow convergence zone proximal to the mitral valve

PISA method requires identifying a hemispheric convergence zone of accelerating flow proximal to the regurgitant orifice, which is then used with aliasing velocity to calculate EROA.

Question 33: A 68-year-old male with a history of rheumatic heart disease presents with dyspnea on exertion. Echocardiography reveals severe tricuspid regurgitation. Which of the following quantitative parameters, derived from the PISA method, is most indicative of severe TR?

Vena Contracta width of 4 mm
Effective Regurgitant Orifice Area (EROA) of 0.45 cm² (Correct answer)
Jet area of 8 cm²
Peak E-wave velocity of 0.8 m/s

Correct answer: Effective Regurgitant Orifice Area (EROA) of 0.45 cm²

An Effective Regurgitant Orifice Area (EROA) ≥ 0.40 cm² is a specific criterion for severe tricuspid regurgitation. A vena contracta width of ≥ 7 mm is considered severe. Jet area is a less specific, qualitative measure. Peak E-wave velocity relates to diastolic function, not directly to the severity of regurgitation.

Question 34: During a stress test, a patient develops 2 mm horizontal ST depression in 5 leads at peak exercise, with the changes persisting for 8 minutes into recovery. What does prolonged ST depression recovery suggest?

Normal variant — recovery time is not clinically significant
More extensive ischemia and higher risk of significant CAD (Correct answer)
Benign response limited to the exercise phase only
Vasospastic angina unrelated to obstructive disease

Correct answer: More extensive ischemia and higher risk of significant CAD

ST depression persisting beyond 5 minutes into recovery is associated with more extensive ischemia and increased likelihood of significant multi-vessel coronary disease.

Question 35: Which finding on color Doppler distinguishes functional from organic mitral regurgitation?

Eccentric jet in functional vs. central jet in organic
Central jet in functional vs. eccentric jet in organic (Correct answer)
Jet area is always larger in organic MR
Vena contracta is always wider in functional MR

Correct answer: Central jet in functional vs. eccentric jet in organic

Functional MR produces a central regurgitant jet due to symmetric leaflet tethering, while organic MR from leaflet prolapse typically produces an eccentric jet directed away from the prolapsing leaflet.

Question 36: Which of the following ECG findings is the defining characteristic of a third-degree atrioventricular (AV) block?

A regular rhythm with a rate of 40-60 bpm and inverted P waves.
A progressively lengthening PR interval followed by a dropped QRS complex.
A constant and prolonged PR interval (>0.20 seconds) for every QRS.
Complete dissociation of P waves and QRS complexes, with atria and ventricles beating independently. (Correct answer)

Correct answer: Complete dissociation of P waves and QRS complexes, with atria and ventricles beating independently.

In third-degree (complete) AV block, no atrial impulses are conducted to the ventricles. This results in the atria (P waves) and ventricles (QRS complexes) being controlled by separate pacemakers, leading to a complete dissociation between the two on the ECG. [2, 11, 19, 21, 27]

Question 37: A 55-year-old patient is scheduled for a treadmill stress test. What is the patient's age-predicted maximum heart rate (APMHR), and what is the heart rate corresponding to 85% of the maximum, a common target for a diagnostically adequate study?

APMHR: 155 bpm; 85% Target: 132 bpm
APMHR: 165 bpm; 85% Target: 140 bpm (Correct answer)
APMHR: 160 bpm; 85% Target: 145 bpm
APMHR: 175 bpm; 85% Target: 149 bpm

Correct answer: APMHR: 165 bpm; 85% Target: 140 bpm

The most commonly used formula to estimate age-predicted maximum heart rate is 220 minus the patient's age. For a 55-year-old: 220 - 55 = 165 bpm. To find the 85% target, calculate 165 * 0.85, which equals 140.25, rounded to 140 bpm. [8, 16, 22]

Question 38: What is the reversal agent for adenosine-induced severe bronchospasm or hypotension during pharmacological stress testing?

Epinephrine 1 mg IV
Atropine 0.5 mg IV
Metoprolol 5 mg IV
Aminophylline 50-100 mg IV (Correct answer)

Correct answer: Aminophylline 50-100 mg IV

Aminophylline (theophylline) competitively antagonizes adenosine receptors and rapidly reverses adenosine-induced side effects.

Question 39: What is the primary hemodynamic effect of intravenous nitroglycerin at low doses used in acute heart failure management?

Venodilation reducing preload and left ventricular filling pressures (Correct answer)
Chronotropic effect increasing heart rate
Arterial vasoconstriction increasing afterload
Positive inotropic effect increasing contractility

Correct answer: Venodilation reducing preload and left ventricular filling pressures

At low IV doses, nitroglycerin primarily causes venodilation, reducing venous return (preload) and decreasing pulmonary congestion and LV filling pressures.

Question 40: Which clinical scenario BEST indicates the need for a bilateral lower extremity venous duplex exam rather than unilateral?

Suspected DVT in a patient with bilateral leg swelling of unknown cause (Correct answer)
Pre-operative mapping for varicose vein ablation on the left leg
Follow-up exam for known right popliteal DVT on anticoagulation
Unilateral calf pain after a long flight

Correct answer: Suspected DVT in a patient with bilateral leg swelling of unknown cause

Bilateral leg swelling without a clear unilateral cause warrants bilateral examination to rule out bilateral DVT or central obstruction.

Question 41: During the assessment of a mechanical mitral prosthesis, an increased mean gradient is noted. Which of the following parameters would be most useful to differentiate true stenosis from a high-flow state?

Pressure Half-Time (PHT)
Left ventricular outflow tract (LVOT) diameter
Peak E-wave velocity
Doppler Velocity Index (DVI) (Correct answer)

Correct answer: Doppler Velocity Index (DVI)

The Doppler Velocity Index (DVI), calculated as the ratio of the VTI of the prosthetic valve to the VTI of the LVOT, is a relatively flow-independent measure. In a high-flow state, both VTIs will increase, keeping the ratio relatively stable. In true stenosis, the prosthetic VTI will be disproportionately high compared to the LVOT VTI, resulting in an increased DVI (for mitral prostheses, a DVI > 2.2 may suggest dysfunction).

Question 42: A patient undergoing lower extremity arterial evaluation has a biphasic waveform at the posterior tibial artery. What does this suggest compared to a normal triphasic waveform?

Mild proximal disease with preserved forward flow (Correct answer)
Complete occlusion
Completely normal finding
Venous reflux contaminating the signal

Correct answer: Mild proximal disease with preserved forward flow

A biphasic waveform with loss of the reverse flow component suggests mild to moderate proximal arterial disease reducing peripheral resistance.

Question 43: Which finding on echocardiography is most consistent with hypertrophic obstructive cardiomyopathy (HOCM)?

Asymmetric septal hypertrophy with systolic anterior motion of the mitral valve (Correct answer)
Apical LV aneurysm
Concentric LV hypertrophy with preserved EF and restrictive filling
Dilated left ventricle with global hypokinesis

Correct answer: Asymmetric septal hypertrophy with systolic anterior motion of the mitral valve

HOCM is characterized by asymmetric septal hypertrophy (ASH) and systolic anterior motion (SAM) of the mitral valve, which causes dynamic LVOT obstruction.

Question 44: Which of the following is a TRUE statement about ionic versus non-ionic contrast media?

Ionic contrast has fewer osmolarity-related side effects
Ionic contrast is preferred in patients with renal insufficiency
Non-ionic contrast is associated with lower rates of allergic-type reactions (Correct answer)
Non-ionic contrast has higher osmolality than ionic contrast

Correct answer: Non-ionic contrast is associated with lower rates of allergic-type reactions

Non-ionic (low-osmolar) contrast agents carry a lower risk of anaphylactoid and hemodynamic reactions compared to high-osmolar ionic agents.

Question 45: Which congenital cardiac lesion most commonly produces isolated pulmonic regurgitation in adults?

Bicuspid pulmonic valve
Rheumatic heart disease involving the pulmonic valve
Carcinoid heart disease
Prior surgical or balloon repair of pulmonic stenosis or tetralogy of Fallot (Correct answer)

Correct answer: Prior surgical or balloon repair of pulmonic stenosis or tetralogy of Fallot

The most common cause of significant pulmonic regurgitation in adults is iatrogenic, resulting from prior repair of pulmonic stenosis or right ventricular outflow tract reconstruction in tetralogy of Fallot.

Question 46: When optimizing 2D image quality, which transducer frequency adjustment would BEST improve near-field resolution in an obese patient with a thick chest wall?

Decrease frequency to improve penetration at the cost of resolution (Correct answer)
Switch to a higher-frame-rate narrow sector
Increase compression to enhance endocardial definition
Increase frequency to maximize axial resolution at depth

Correct answer: Decrease frequency to improve penetration at the cost of resolution

Lower ultrasound frequencies penetrate tissue more effectively but with reduced resolution; in obese patients, lowering frequency is necessary to reach cardiac structures.

Question 47: Paradoxical low-flow, low-gradient aortic stenosis differs from classic low-flow, low-gradient AS by having:

Preserved ejection fraction with reduced stroke volume index (Correct answer)
Reduced ejection fraction below 50%
Elevated mean gradient above 40 mmHg
Normal indexed valve area above 0.85 cm²/m²

Correct answer: Preserved ejection fraction with reduced stroke volume index

Paradoxical LFLG AS features preserved EF (≥50%) but low stroke volume index (<35 mL/m²) due to small, hypertrophied LV with diastolic dysfunction causing low gradients despite true severe stenosis.

Question 48: A pacing lead impedance measurement of 150 ohms is most consistent with which condition?

Normal lead function
Lead fracture (open circuit)
Lead insulation breach (short circuit) (Correct answer)
Battery end-of-life

Correct answer: Lead insulation breach (short circuit)

Normal pacing lead impedance is 300–1,000 ohms; impedance below 200 ohms suggests an insulation break causing a short circuit, while >2,000 ohms suggests lead fracture.

Question 49: The term 'preload' in cardiac physiology is best equated with:

Ventricular wall tension during systole
Aortic diastolic pressure
Systemic vascular resistance
Left ventricular end-diastolic volume or pressure (Correct answer)

Correct answer: Left ventricular end-diastolic volume or pressure

Preload represents the degree of ventricular stretch at end-diastole, clinically approximated by end-diastolic volume (EDV) or filling pressure (EDP).

Question 50: In a patient with a large arteriovenous fistula, which hemodynamic change is expected in the feeding artery?

Increased RI with absent diastolic flow
Monophasic waveform with reverse flow
Decreased RI with high diastolic flow (Correct answer)
Normal triphasic waveform

Correct answer: Decreased RI with high diastolic flow

An AV fistula creates a low-resistance pathway, producing low RI and elevated diastolic flow in the feeding artery.

Question 51: In 3D echocardiography, what is the primary advantage over 2D echo for left ventricular volume assessment?

It does not require ECG gating
It is faster to acquire
It eliminates geometric assumptions and foreshortening of the LV apex (Correct answer)
It has better temporal resolution

Correct answer: It eliminates geometric assumptions and foreshortening of the LV apex

3D echocardiography acquires the full LV volume without relying on geometric models, eliminating foreshortening and providing more accurate and reproducible volume measurements.

Question 52: Which vascular access site is most commonly associated with pneumothorax as a complication of pacemaker lead implantation?

Subclavian vein (Correct answer)
Cephalic vein
Internal jugular vein
Femoral vein

Correct answer: Subclavian vein

Subclavian vein access carries the highest risk of pneumothorax due to its proximity to the lung apex; the cephalic vein cutdown is safer in this regard.

Question 53: Which finding on 2D echocardiography is most specific for mitral valve prolapse?

E/A ratio reversal on mitral inflow Doppler
Eccentric mitral regurgitation jet on apical 4-chamber view
Mitral leaflet thickening >5 mm in any view
Billowing of mitral leaflet(s) >2 mm posterior to the annular plane in the parasternal long-axis view (Correct answer)

Correct answer: Billowing of mitral leaflet(s) >2 mm posterior to the annular plane in the parasternal long-axis view

The diagnostic criterion for MVP is systolic displacement of one or both leaflets ≥2 mm beyond the mitral annular plane in the parasternal long-axis view, which avoids false positives from the saddle-shaped annulus.

Question 54: Which statement about continuous wave (CW) Doppler is correct?

It can measure very high velocities without aliasing (Correct answer)
It has a maximum velocity limit set by the Nyquist theorem
It uses a single pulsing crystal
It has range resolution and can pinpoint sample depth

Correct answer: It can measure very high velocities without aliasing

CW Doppler continuously transmits and receives without pulsing, so it has no PRF limit and can accurately measure very high velocities without aliasing.

Question 55: Which stress testing modality is preferred for evaluating coronary artery disease in a patient with a left bundle branch block (LBBB)?

Dobutamine stress echocardiography
Adenosine or regadenoson myocardial perfusion imaging (Correct answer)
Submaximal bicycle ergometry with ECG monitoring
Standard Bruce protocol treadmill ECG stress test

Correct answer: Adenosine or regadenoson myocardial perfusion imaging

LBBB causes false-positive septal perfusion defects with exercise; vasodilator pharmacological stress (adenosine/regadenoson) with imaging avoids this artifact.

Question 56: Which mode of echocardiography provides the highest temporal resolution for cardiac motion analysis?

2D imaging
Color flow Doppler
3D echocardiography
M-mode (Correct answer)

Correct answer: M-mode

M-mode records a single line of information at a very high frame rate (typically 1,000 frames/sec), providing superior temporal resolution for cardiac motion.

Question 57: A patient is found to have significant pulmonic regurgitation (PR) on a routine echocardiogram. Which of the following is an established echocardiographic criterion for classifying the PR as severe?

A brief, early diastolic color Doppler jet
Pressure half-time (PHT) of 250 ms
Diastolic flow reversal in the branch pulmonary arteries (Correct answer)
Regurgitant jet width <50% of the RVOT diameter

Correct answer: Diastolic flow reversal in the branch pulmonary arteries

The presence of diastolic flow reversal in the branch pulmonary arteries is a specific and supportive sign of severe pulmonic regurgitation. Other signs of severe PR include a dense CW signal with a steep deceleration slope (PHT <100 ms) and a wide color Doppler jet origin.

Question 58: A patient with an ABI of 0.55 complains of calf pain after walking one block. Which classification best describes this patient's peripheral arterial disease severity?

Severe PAD
Critical limb ischemia
Moderate PAD (Correct answer)
Mild PAD

Correct answer: Moderate PAD

An ABI of 0.41–0.70 with claudication at short distances indicates moderate PAD.

Question 59: Which echocardiographic parameter BEST distinguishes constrictive pericarditis from restrictive cardiomyopathy?

Respiratory variation in mitral E velocity >25% with septal bounce (Correct answer)
Mitral inflow E/A ratio
Left atrial volume index
Pulmonary vein D-wave velocity

Correct answer: Respiratory variation in mitral E velocity >25% with septal bounce

Constrictive pericarditis demonstrates >25% respirophasic variation in mitral E velocity and interventricular septal bounce due to enhanced ventricular interdependence, unlike restrictive cardiomyopathy.

Question 60: What is the maximum infusion rate of dobutamine typically used in a standard dobutamine stress echocardiography protocol?

40 mcg/kg/min (Correct answer)
30 mcg/kg/min
50 mcg/kg/min
20 mcg/kg/min

Correct answer: 40 mcg/kg/min

The standard dobutamine stress echo protocol escalates to a maximum of 40 mcg/kg/min, with atropine added if target heart rate is not achieved.

Question 61: Acoustic shadowing distal to a calcified structure occurs because:

Reverberation fills the distal area with echoes
Refraction bends sound around the structure
The structure enhances sound transmission
The structure absorbs and reflects most of the incident sound energy (Correct answer)

Correct answer: The structure absorbs and reflects most of the incident sound energy

Dense calcified structures have very high acoustic impedance and absorb or reflect nearly all incident ultrasound, leaving a hypoechoic (shadow) region posterior to the structure.

Question 62: During a lower extremity arterial duplex exam, you detect a peak systolic velocity (PSV) ratio of 4.2 at the superficial femoral artery. What does this ratio indicate?

Occlusion
75–99% stenosis (Correct answer)
50–74% stenosis
Less than 50% stenosis

Correct answer: 75–99% stenosis

A PSV ratio greater than 4.0 at a stenotic segment indicates 75–99% diameter reduction.

Question 63: What is the primary indication for an implantable cardioverter-defibrillator (ICD)?

Prevention of sudden cardiac death from ventricular arrhythmias (Correct answer)
Symptomatic complete heart block
Sick sinus syndrome unresponsive to medications
Chronic atrial fibrillation with slow ventricular response

Correct answer: Prevention of sudden cardiac death from ventricular arrhythmias

ICDs are implanted primarily for secondary prevention of sudden cardiac death in survivors of VF or sustained VT, or for primary prevention in high-risk patients with reduced ejection fraction.

Question 64: The Gorlin formula is a standard calculation used in the cardiac catheterization lab to determine which of the following parameters?

Cardiac index
Pulmonary vascular resistance
Mitral regurgitant fraction
Aortic valve area (Correct answer)

Correct answer: Aortic valve area

The Gorlin formula is a well-established hemodynamic calculation used to estimate the area of a stenotic valve, most commonly the aortic or mitral valve. It uses cardiac output, the systolic or diastolic filling period, heart rate, and the mean pressure gradient across the valve to derive the valve area in cm². [1, 4, 10]

Question 65: Cardiac output is calculated as:

Mean arterial pressure ÷ systemic vascular resistance
Heart rate × stroke volume (Correct answer)
Stroke volume ÷ heart rate
Heart rate × end-diastolic volume

Correct answer: Heart rate × stroke volume

Cardiac output (CO) equals heart rate (HR) multiplied by stroke volume (SV), representing the total volume of blood pumped per minute.

Question 66: When using a thermodilution catheter to measure cardiac output, which injectate temperature produces the MOST accurate results?

Temperature does not affect accuracy
Room temperature (approximately 22°C)
Iced saline (approximately 0–4°C) (Correct answer)
Body temperature (37°C)

Correct answer: Iced saline (approximately 0–4°C)

Iced injectate creates a larger temperature differential, improving signal-to-noise ratio and accuracy of the thermodilution curve.

Question 67: Which congenital lesion classically produces a 'double density' sign on chest X-ray and a dilated right atrium on echocardiography?

Ebstein anomaly (Correct answer)
Coarctation of the aorta
Tetralogy of Fallot
Ventricular septal defect

Correct answer: Ebstein anomaly

Ebstein anomaly causes massive right atrial and atrialized right ventricular enlargement, producing a 'box-shaped' heart with a double density on CXR.

Question 68: In M-mode echocardiography, which measurement is used to calculate left ventricular ejection fraction using the Teichholz method?

Left ventricular end-diastolic and end-systolic dimensions (Correct answer)
Right ventricular diameter
Peak aortic velocity
Mitral valve E-point septal separation only

Correct answer: Left ventricular end-diastolic and end-systolic dimensions

The Teichholz method uses left ventricular end-diastolic dimension (LVEDD) and end-systolic dimension (LVESD) from M-mode to calculate ejection fraction.

Question 69: In a patient undergoing exercise stress echocardiography for asymptomatic mitral stenosis, which finding at peak exercise warrants intervention?

Failure of heart rate to increase by 10 bpm
Exercise-induced mean mitral gradient >15 mmHg or pulmonary artery systolic pressure >60 mmHg (Correct answer)
Peak transmitral velocity >2 m/s at rest only
No change in mitral valve area with exercise

Correct answer: Exercise-induced mean mitral gradient >15 mmHg or pulmonary artery systolic pressure >60 mmHg

Exercise-induced mean gradient >15 mmHg or PASP >60 mmHg identifies hemodynamically significant MS even in asymptomatic patients, supporting earlier intervention per ACC/AHA guidelines.

Question 70: What does the term 'critical stenosis' refer to in vascular hemodynamics?

Stenosis requiring immediate surgical intervention
The degree of stenosis beyond which resting flow begins to fall (Correct answer)
Stenosis associated with plaque ulceration
Any stenosis visible on angiography

Correct answer: The degree of stenosis beyond which resting flow begins to fall

Critical stenosis is the threshold (approximately 75% area reduction or 50% diameter reduction) beyond which autoregulatory mechanisms can no longer maintain resting flow.

Question 71: Which echocardiographic finding is most consistent with constrictive pericarditis rather than restrictive cardiomyopathy?

Biatrial enlargement with normal pericardium
E/e' ratio >14 with preserved LV size
Markedly increased myocardial thickness
Septal bounce with respiratory variation in mitral inflow >25% and tissue Doppler e' >9 cm/s (Correct answer)

Correct answer: Septal bounce with respiratory variation in mitral inflow >25% and tissue Doppler e' >9 cm/s

Constrictive pericarditis shows a septal bounce, >25% respiratory variation in mitral inflow, and preserved or elevated e' (annulus paradoxus) due to the rigid pericardium enhancing ventricular coupling.

Question 72: A patient with aortic stenosis has an LVOT diameter of 2.0 cm, LVOT VTI of 18 cm, and AV VTI of 90 cm. What is the calculated aortic valve area?

0.80 cm²
1.26 cm²
1.57 cm²
0.63 cm² (Correct answer)

Correct answer: 0.63 cm²

AVA = π×(1.0)²×18/90 = 3.14×0.18 = 0.63 cm², indicating severe aortic stenosis (AVA <1.0 cm²).

Question 73: What is the primary advantage of harmonic imaging over fundamental imaging in echocardiography?

Reduced side lobe artifacts and improved endocardial border definition (Correct answer)
Higher frame rate
Increased temporal resolution
Better far-field penetration at low frequencies

Correct answer: Reduced side lobe artifacts and improved endocardial border definition

Harmonic imaging uses the second harmonic frequency generated by tissue, reducing near-field artifacts and side lobes to improve endocardial border visualization.

Question 74: A chemistry check would determine information regarding all of the following, except_______:

Liver
Blood glucose
Brain (Correct answer)
Kidneys

Correct answer: Brain

Explanation: <br> A chemistry check, also known as a basic metabolic panel (BMP) or comprehensive metabolic panel (CMP), typically assesses the function of organs such as the kidneys, liver, and blood glucose levels. However, it does not provide information specifically about the brain.

Question 75: Which bioeffect mechanism is most relevant to diagnostic ultrasound safety concerns at standard clinical intensities?

Cavitation (both stable and inertial) (Correct answer)
Radiation pressure effects
Ionizing radiation exposure
Thermal damage from continuous heating

Correct answer: Cavitation (both stable and inertial)

Cavitation—oscillation and possible collapse of microbubbles in tissue—is the primary non-thermal bioeffect concern, though significant risk at diagnostic power levels is not established.

Question 76: The left circumflex artery typically supplies which portion of the left ventricle?

Lateral wall and posterior wall (Correct answer)
Inferior wall and posterior descending territory
Interventricular septum
Anterior wall and apex

Correct answer: Lateral wall and posterior wall

The left circumflex artery courses in the left AV groove and typically supplies the lateral and posterior walls of the left ventricle via obtuse marginal branches.

Question 77: Which safety concern is unique to transesophageal echocardiography (TEE) compared to transthoracic echocardiography (TTE)?

Ultrasound bioeffects on myocardial tissue
Risk of esophageal perforation and aspiration (Correct answer)
Excessive radiation exposure
Contrast agent anaphylaxis

Correct answer: Risk of esophageal perforation and aspiration

TEE requires esophageal intubation, introducing risks of esophageal perforation, laryngospasm, aspiration, and complications related to sedation not present with TTE.

Question 78: Which echocardiographic view is obtained by placing the transducer at the left parasternal border to visualize the long axis of the heart?

Apical four-chamber view
Subcostal view
Suprasternal notch view
Parasternal long-axis view (Correct answer)

Correct answer: Parasternal long-axis view

The parasternal long-axis view is obtained at the left parasternal border and displays the left ventricle, mitral valve, aortic valve, and aortic root along the long axis.

Question 79: When a magnet is applied to a permanent pacemaker, what is the primary purpose of this maneuver in clinical assessment?

To assess battery status by inducing asynchronous pacing at a magnet rate (Correct answer)
To permanently reprogram the pacing mode
To deliver antitachycardia pacing
To increase the pacing sensitivity

Correct answer: To assess battery status by inducing asynchronous pacing at a magnet rate

Magnet application causes most pacemakers to pace asynchronously at a manufacturer-specific magnet rate; a decrease in this rate from the beginning-of-life rate indicates battery depletion approaching end-of-life.

Question 80: In left bundle branch block (LBBB), which leads typically show broad monophasic R waves?

V1, V2, V3
II, III, aVF
aVR, V1, V4
I, aVL, V5, V6 (Correct answer)

Correct answer: I, aVL, V5, V6

LBBB produces broad, notched, or slurred monophasic R waves in the lateral leads (I, aVL, V5, V6) due to delayed left ventricular depolarization.

Question 81: Which of the following best describes the Frank-Starling mechanism?

Afterload is inversely proportional to ejection fraction
Increased heart rate leads to decreased stroke volume
Greater ventricular end-diastolic volume produces greater stroke volume (Correct answer)
Heart rate is directly controlled by preload

Correct answer: Greater ventricular end-diastolic volume produces greater stroke volume

The Frank-Starling law states that within physiological limits, increased stretch of cardiac muscle fibers (higher preload) results in a more forceful contraction and greater stroke volume.

Question 82: Which B-mode gray-scale finding suggests CHRONIC rather than acute DVT?

Anechoic, homogeneous intraluminal material
Echogenic, retracted thrombus with partial recanalization (Correct answer)
Vein wall indistinguishable from thrombus
Distended vein lumen with soft thrombus

Correct answer: Echogenic, retracted thrombus with partial recanalization

Chronic DVT typically appears echogenic (bright) and contracted, often with partial recanalization channels visible on color Doppler.

Question 83: The chordae tendineae attach the leaflets of the AV valves to which cardiac structures?

Interventricular septum
Trabeculae carneae
Moderator band
Papillary muscles (Correct answer)

Correct answer: Papillary muscles

Chordae tendineae are fibrous cords that connect the AV valve leaflets to the papillary muscles, preventing leaflet prolapse during ventricular systole.

Question 84: What finding on echo Doppler is used to non-invasively estimate right ventricular systolic pressure (RVSP)?

Tricuspid annular plane systolic excursion (TAPSE)
Peak tricuspid regurgitation jet velocity using the modified Bernoulli equation (Correct answer)
Pulmonary valve deceleration time
Right ventricular outflow tract diameter

Correct answer: Peak tricuspid regurgitation jet velocity using the modified Bernoulli equation

RVSP is estimated by applying the modified Bernoulli equation (4v²) to the peak TR jet velocity and adding estimated right atrial pressure.

Question 85: Which echocardiographic technique measures myocardial deformation to detect subtle dysfunction before overt wall motion abnormalities?

Anatomical M-mode
Continuous wave Doppler
M-mode echocardiography
Speckle tracking strain imaging (Correct answer)

Correct answer: Speckle tracking strain imaging

Speckle tracking strain imaging tracks acoustic speckles frame-to-frame to quantify myocardial deformation (strain), detecting subclinical dysfunction earlier than visual wall motion assessment.

Question 86: In the evaluation of carotid artery dissection, which duplex finding is MOST commonly observed?

Concentric calcified plaque at the bifurcation
Eccentric hypoechoic thickening of the arterial wall with luminal narrowing (Correct answer)
Absent spectral broadening with normal peak velocities
Posterior acoustic shadowing from the vessel wall

Correct answer: Eccentric hypoechoic thickening of the arterial wall with luminal narrowing

Carotid dissection produces an intramural hematoma seen as eccentric hypoechoic wall thickening that narrows the true lumen.

Question 87: Harmonic imaging improves image quality primarily by:

Increasing pulse repetition frequency
Increasing transmitted frequency
Widening the beam width
Reducing side lobe and reverberation artifacts (Correct answer)

Correct answer: Reducing side lobe and reverberation artifacts

Tissue harmonic imaging uses the second harmonic frequency generated within tissue, which has a narrower beam and fewer near-field artifacts than the fundamental frequency.

Question 88: A patient with a history of DVT returns for follow-up. Duplex shows a recanalized femoral vein with echogenic walls and intraluminal webs. This BEST describes:

Chronic post-thrombotic changes (Correct answer)
Fresh acute DVT extending into a recanalized segment
Venous aneurysm formation
Normal femoral vein appearance

Correct answer: Chronic post-thrombotic changes

Recanalized vein with echogenic walls and synechiae (webs) are hallmark duplex findings of chronic post-thrombotic changes.

Question 89: In assessing pulmonic stenosis severity, a peak instantaneous Doppler gradient of 65 mmHg indicates:

Severe pulmonic stenosis (>64 mmHg) (Correct answer)
Mild pulmonic stenosis (<36 mmHg)
Moderate pulmonic stenosis (36–64 mmHg)
Trivial pulmonic stenosis

Correct answer: Severe pulmonic stenosis (>64 mmHg)

A peak gradient exceeding 64 mmHg defines severe pulmonic stenosis; these patients typically qualify for percutaneous balloon pulmonic valvuloplasty.

Question 90: The Carpentier classification for mitral regurgitation Type II refers to:

Normal leaflet motion with annular dilation
Excessive leaflet motion (prolapse or flail) (Correct answer)
Restricted leaflet motion in systole and diastole
Restricted leaflet motion in systole only

Correct answer: Excessive leaflet motion (prolapse or flail)

Carpentier Type II includes excessive leaflet motion caused by elongated or ruptured chordae tendineae or papillary muscle, producing prolapse or a flail segment.

Question 91: Which echocardiographic finding is characteristic of cardiac tamponade?

Mitral valve prolapse with regurgitation
Enlarged left atrium only
Right ventricular diastolic collapse and respiratory variation in mitral inflow >25% (Correct answer)
Left ventricular hypertrophy

Correct answer: Right ventricular diastolic collapse and respiratory variation in mitral inflow >25%

Cardiac tamponade produces RV diastolic collapse, RA systolic collapse, and >25% respiratory variation in mitral inflow velocity due to elevated pericardial pressure.

Question 92: Which of the following conditions would most likely lead to an increase in blood viscosity and, consequently, an increase in vascular resistance?

Anemia
Hypothermia
Polycythemia (Correct answer)
Vasodilation

Correct answer: Polycythemia

Polycythemia is a condition characterized by an abnormally high concentration of red blood cells (hematocrit), which significantly increases the thickness or viscosity of the blood. According to Poiseuille's law, resistance is directly proportional to viscosity, so an increase in viscosity leads to higher vascular resistance. Anemia would decrease viscosity, and vasodilation affects vessel radius, not viscosity directly.

Question 93: A 'comet-tail' artifact seen posterior to a small hyperechoic focus is most likely caused by:

Side lobes from the transducer
Reverberation between closely spaced strong reflectors creating a bright tapering trail (Correct answer)
Refraction at a curved surface
Acoustic shadowing from calcification

Correct answer: Reverberation between closely spaced strong reflectors creating a bright tapering trail

Comet-tail artifacts arise from reverberation between the near and far walls of a small metallic or calcified reflector, producing a bright tapering trail of echoes distal to the focus.

Question 94: The continuity equation is used primarily to calculate which valve area?

Pulmonic valve area
Tricuspid valve area
Aortic valve area (Correct answer)
Mitral valve area

Correct answer: Aortic valve area

The continuity equation (AVA = LVOT area × LVOT VTI / AV VTI) is the standard method for calculating aortic valve area by echocardiography.

Question 95: During carotid duplex, spectral broadening is defined as filling in of which portion of the Doppler waveform?

The temporal window beneath the systolic peak (systolic window) (Correct answer)
The systolic peak above the baseline
The diastolic window below the spectral envelope
The entire spectral window including the baseline

Correct answer: The temporal window beneath the systolic peak (systolic window)

Normal laminar flow produces a clear systolic window (spectral window) under the waveform envelope; spectral broadening fills this window, indicating turbulent or disturbed flow.

Question 96: A duplex ultrasound of the superficial femoral artery (SFA) reveals an area of plaque with spectral broadening and elevated velocities. The peak systolic velocity (PSV) within the stenosis is 250 cm/s. The PSV in the SFA segment just proximal to the stenosis is 100 cm/s. Based on the velocity ratio, how would this stenosis be graded?

Mild; <50% stenosis
Severe; >75% stenosis
Normal; <50% stenosis
Moderate; 50-74% stenosis (Correct answer)

Correct answer: Moderate; 50-74% stenosis

The velocity ratio (VR) is calculated as PSV at stenosis / PSV proximal to stenosis. Here, VR = 250 cm/s / 100 cm/s = 2.5. A velocity ratio of 2.0 or greater (specifically a range of approximately 2.0-4.0) is a widely accepted criterion for a hemodynamically significant stenosis of 50% or greater. A ratio of 2.5 falls into the moderate, or 50-74%, stenosis category.

Question 97: Which of the following describes a 'type A' coronary lesion morphology per the ACC/AHA classification?

Lesion with thrombus or heavy calcification
Chronic total occlusion >3 months duration
Discrete lesion <10 mm, concentric, non-angulated, smooth contour (Correct answer)
Bifurcation lesion requiring side-branch protection

Correct answer: Discrete lesion <10 mm, concentric, non-angulated, smooth contour

Type A lesions are discrete, concentric, accessible, and non-calcified, carrying the highest procedural success and lowest complication rates.

Question 98: During ICD device interrogation, a stored electrogram shows a fast, polymorphic ventricular rhythm followed by a shock that restored sinus rhythm. This most likely represents:

Pacemaker-mediated tachycardia with committed shock
Inappropriate therapy due to T-wave oversensing
Appropriate ICD therapy for ventricular fibrillation (Correct answer)
Inappropriate therapy due to atrial fibrillation with RVR

Correct answer: Appropriate ICD therapy for ventricular fibrillation

A stored electrogram showing rapid polymorphic ventricular activity that terminates after an ICD shock returning to sinus rhythm is consistent with appropriate therapy for ventricular fibrillation.

Question 99: When sector width is reduced on a 2D echocardiographic image, the primary benefit is:

Wider field of view
Reduced gain requirement
Improved penetration depth
Increased frame rate (Correct answer)

Correct answer: Increased frame rate

A narrower sector requires fewer scan lines per frame, allowing the system to update the image more frequently and increasing frame rate.

Question 100: Which lead configuration is considered most sensitive for detecting stress-induced ischemic ST changes during exercise ECG testing?

Leads II, III, and aVF
Lead aVR and V1
Leads V4, V5, and V6 (Correct answer)
Lead I and aVL only

Correct answer: Leads V4, V5, and V6

The lateral precordial leads V4, V5, and V6 are most sensitive for detecting subendocardial ischemia during stress testing.

Question 101: Which prosthetic valve type is preferred for a 35-year-old woman who desires future pregnancy and wants to avoid long-term anticoagulation?

Transcatheter valve-in-valve
Mechanical valve with aspirin alone
There is no perfect option; mechanical valves require anticoagulation (teratogenic warfarin risk) while bioprosthetic valves degenerate faster in young patients (Correct answer)
Bioprosthetic valve without any anticoagulation

Correct answer: There is no perfect option; mechanical valves require anticoagulation (teratogenic warfarin risk) while bioprosthetic valves degenerate faster in young patients

Both valve types present challenges: mechanical valves require warfarin (risk of fetal loss/embryopathy) while bioprosthetic valves deteriorate faster in young women, especially during pregnancy, making this a shared decision.

Question 102: On a coronary angiogram, the left anterior descending (LAD) artery primarily supplies which cardiac territory?

Lateral wall and posterior descending territory
Right ventricular free wall exclusively
Anterior wall and anterior two-thirds of the interventricular septum (Correct answer)
Inferior wall and posterior interventricular septum

Correct answer: Anterior wall and anterior two-thirds of the interventricular septum

The LAD supplies the anterior left ventricular wall, apex, and anterior septum via diagonal and septal perforator branches.

Question 103: During evaluation of a femoral artery pseudoaneurysm post-catheterization, duplex imaging reveals a to-and-fro flow pattern in the neck connecting the pseudoaneurysm sac to the native artery. What does this pattern represent?

Arteriovenous fistula communication
Bidirectional flow characteristic of a pseudoaneurysm neck (Correct answer)
Turbulence from vessel stenosis
Normal post-procedure arterial flow

Correct answer: Bidirectional flow characteristic of a pseudoaneurysm neck

The classic to-and-fro pattern in the pseudoaneurysm neck reflects inflow during systole and outflow during diastole between the sac and native artery.

Question 104: When performing a venous duplex exam, the Valsalva maneuver is MOST useful for evaluating:

Calf vein thrombosis
Perforator vein diameter
Popliteal vein compressibility
Competence of the saphenofemoral junction valve (Correct answer)

Correct answer: Competence of the saphenofemoral junction valve

The Valsalva maneuver increases intra-abdominal pressure and tests valve competence at the SFJ by provoking reflux if valves are incompetent.

Question 105: A patient has a measured Qp:Qs ratio of 2.5:1. How should this be interpreted?

No significant shunt is present
A left-to-right shunt with pulmonary blood flow 2.5 times systemic flow (Correct answer)
A right-to-left shunt with pulmonary blood flow reduced by 2.5 times
Pulmonary hypertension with elevated PVR

Correct answer: A left-to-right shunt with pulmonary blood flow 2.5 times systemic flow

A Qp:Qs ratio of 2.5:1 indicates a significant left-to-right shunt where pulmonary blood flow is 2.5 times systemic blood flow, typically warranting intervention.

Question 106: What is the significance of a left ventricular wall motion score index (WMSI) greater than 1.0 on stress echocardiography?

Normal myocardial function throughout
Right ventricular pressure overload
Hyperdynamic left ventricular function
Evidence of regional wall motion abnormalities suggesting ischemia or infarction (Correct answer)

Correct answer: Evidence of regional wall motion abnormalities suggesting ischemia or infarction

A WMSI >1.0 indicates that at least one segment has abnormal wall motion (hypokinesis, akinesis, or dyskinesis), suggesting ischemia or prior infarction.

Question 107: The mechanical index (MI) displayed on an ultrasound machine is most closely associated with the risk of:

Reverberation artifacts
Thermal heating of tissue
Cavitation and non-thermal mechanical bioeffects (Correct answer)
Electrical interference

Correct answer: Cavitation and non-thermal mechanical bioeffects

MI = peak negative pressure / √frequency; higher MI values indicate greater potential for cavitation and non-thermal mechanical bioeffects.

Question 108: What does the tissue Doppler imaging (TDI) parameter e' (e-prime) measure?

Early diastolic myocardial relaxation velocity at the mitral annulus (Correct answer)
Peak aortic outflow velocity
Isovolumic relaxation time
Peak systolic myocardial contraction velocity

Correct answer: Early diastolic myocardial relaxation velocity at the mitral annulus

TDI e' measures early diastolic myocardial velocity at the mitral annulus (septal or lateral), reflecting myocardial relaxation and used to estimate LV filling pressures via E/e' ratio.

Question 109: A sonographer asks a patient to perform the Valsalva maneuver during a venous insufficiency study while interrogating the saphenofemoral junction. What is the primary purpose of this technique?

To decrease the heart rate and improve Doppler signal quality
To increase intra-abdominal pressure and test for valvular competence (Correct answer)
To assess for deep vein thrombosis in the iliac veins
To increase arterial inflow to the lower extremities

Correct answer: To increase intra-abdominal pressure and test for valvular competence

The Valsalva maneuver (straining against a closed glottis) significantly increases intra-thoracic and intra-abdominal pressure. This pressure is transmitted down the venous system. In a patient with competent valves, this will cause flow to slow or cease. If the valves are incompetent, the increased proximal pressure will cause blood to flow backward (reflux) past the faulty valve, which can be detected by Doppler.

Question 110: Which layer of the heart wall is the thickest and composed primarily of cardiac muscle responsible for the heart's pumping action?

Myocardium (Correct answer)
Pericardium
Endocardium
Epicardium

Correct answer: Myocardium

The heart wall consists of three layers: the inner endocardium, the middle myocardium, and the outer epicardium. The myocardium is the muscular middle layer and is the thickest of the three. Its powerful contractions are responsible for pumping blood out of the heart. The thickness of the myocardium varies, being thickest in the left ventricle.

Question 111: Which transducer type is most commonly used for adult transthoracic echocardiography?

Phased array (Correct answer)
Linear array
Mechanical sector
Curvilinear array

Correct answer: Phased array

Phased array transducers use electronic steering to create a small footprint with a wide sector image, making them ideal for imaging through narrow intercostal spaces.

Question 112: In tricuspid regurgitation severity assessment, a vena contracta width of >7 mm indicates:

Mild tricuspid regurgitation
Severe tricuspid regurgitation (Correct answer)
Trace tricuspid regurgitation
Moderate tricuspid regurgitation

Correct answer: Severe tricuspid regurgitation

A vena contracta width greater than 7 mm is a specific marker of severe tricuspid regurgitation by ASE 2017 guideline criteria.

Question 113: Which condition is most commonly associated with rheumatic mitral stenosis?

Posterior leaflet prolapse
Chordal elongation
Isolated annular calcification
Commissural fusion with leaflet thickening (Correct answer)

Correct answer: Commissural fusion with leaflet thickening

Rheumatic disease causes commissural fusion, leaflet thickening, and subvalvular disease, producing the classic 'hockey stick' anterior leaflet deformity.

Question 114: Which of the following correctly identifies the 'v wave' on the pulmonary capillary wedge pressure tracing?

Atrial contraction during late diastole
Opening of the mitral valve at end-systole
Passive ventricular filling of the left atrium during ventricular systole with mitral valve closed (Correct answer)
Right ventricular end-diastolic pressure

Correct answer: Passive ventricular filling of the left atrium during ventricular systole with mitral valve closed

The v wave represents passive filling of the left atrium during ventricular systole while the mitral valve is closed; a large v wave suggests mitral regurgitation.

Question 115: In a patient with suspected aortic stenosis and atrial fibrillation, which adaptation to the Doppler technique improves AVA accuracy?

Averaging gradients and VTI over at least 5 cardiac cycles to account for beat-to-beat variability (Correct answer)
Applying pressure half-time instead of continuity equation
Measuring only during sinus beats if AV node is conducting
Using the highest single-beat gradient recorded

Correct answer: Averaging gradients and VTI over at least 5 cardiac cycles to account for beat-to-beat variability

In atrial fibrillation, stroke volume varies cycle to cycle; averaging Doppler measurements over a minimum of 5 beats reduces variability and improves reliability of the continuity equation AVA.

Question 116: Which Doppler finding is most characteristic of severe mitral stenosis?

Deceleration time >280 ms
Pressure half-time >220 ms (Correct answer)
Pressure half-time <100 ms
E/A ratio <1.0

Correct answer: Pressure half-time >220 ms

A pressure half-time greater than 220 ms corresponds to a mitral valve area of approximately 1.0 cm² or less, indicating severe mitral stenosis.

Question 117: Which pharmacological agent used in stress testing works by causing coronary vasodilation through A2A adenosine receptor agonism?

Regadenoson (Correct answer)
Dobutamine
Atropine
Metoprolol

Correct answer: Regadenoson

Regadenoson is a selective A2A adenosine receptor agonist that causes coronary vasodilation and is used as a pharmacological stress agent.

Question 118: Mean arterial pressure (MAP) is best approximated by which formula?

Diastolic + (Pulse pressure / 3) (Correct answer)
Systolic − Diastolic
2 × Diastolic + Systolic / 3
(Systolic + Diastolic) / 2

Correct answer: Diastolic + (Pulse pressure / 3)

MAP ≈ Diastolic + (1/3 × pulse pressure) because diastole occupies approximately two-thirds of the cardiac cycle.

Question 119: In hypertrophic obstructive cardiomyopathy (HOCM), systolic anterior motion (SAM) of the mitral valve results from which mechanism?

Prolapse of the posterior mitral leaflet into the left atrium
Flail anterior mitral leaflet due to chordal rupture
Venturi effect drawing the mitral leaflet toward the septum during systole (Correct answer)
Calcification of the mitral annulus restricting leaflet motion

Correct answer: Venturi effect drawing the mitral leaflet toward the septum during systole

High-velocity systolic flow through the narrowed LVOT creates a Venturi effect that draws the anterior mitral leaflet toward the hypertrophied septum, causing dynamic obstruction.

Question 120: Which finding on coronary angiography is described as TIMI 2 flow?

No antegrade flow beyond the point of occlusion
Partial perfusion with contrast filling but clearing by 3 cardiac cycles
Partial perfusion with contrast filling the distal vessel slowly, not clearing by the end of 3 cardiac cycles (Correct answer)
Complete and rapid filling of the distal vessel equal to a non-culprit artery

Correct answer: Partial perfusion with contrast filling the distal vessel slowly, not clearing by the end of 3 cardiac cycles

TIMI 2 flow describes partial perfusion where contrast fills the distal coronary bed beyond the lesion but clears more slowly than normal (not within 3 cardiac cycles).

Question 121: Which property of ultrasound determines the maximum depth of penetration in tissue?

Amplitude
Frequency (Correct answer)
Wavelength
Pulse repetition frequency

Correct answer: Frequency

Lower frequencies penetrate deeper because attenuation increases with frequency, so lower frequencies lose less energy per unit depth.

Question 122: Which color flow Doppler finding in the hepatic veins indicates severe tricuspid regurgitation?

Systolic flow reversal in the hepatic veins (Correct answer)
Diastolic dominance in hepatic veins
Increased E-wave velocity in hepatic veins
Blunted systolic hepatic vein flow

Correct answer: Systolic flow reversal in the hepatic veins

Systolic reversal of hepatic venous flow is a specific indicator of severe tricuspid regurgitation, reflecting retrograde transmission of high right atrial pressure into the venous system.

Question 123: In the Fick method for cardiac output calculation, what three variables are required?

Heart rate, stroke volume, and PCWP
CVP, PCWP, and mean PAP
Oxygen consumption, arterial O₂ content, and mixed venous O₂ content (Correct answer)
Systolic BP, diastolic BP, and heart rate

Correct answer: Oxygen consumption, arterial O₂ content, and mixed venous O₂ content

The Fick principle states CO = VO₂ / (CaO₂ – CvO₂), requiring whole-body oxygen consumption, arterial oxygen content, and mixed venous oxygen content.

Question 124: A patient with mitral valve prolapse and a flail posterior leaflet has a regurgitant volume of 72 mL/beat. According to ASE guidelines, this represents:

Severe mitral regurgitation (≥60 mL/beat) (Correct answer)
Moderate mitral regurgitation (30–59 mL/beat)
Moderate-to-severe mitral regurgitation (45–59 mL/beat)
Mild mitral regurgitation (<30 mL/beat)

Correct answer: Severe mitral regurgitation (≥60 mL/beat)

Regurgitant volume ≥60 mL per beat meets the quantitative threshold for severe mitral regurgitation according to 2017 ASE valve guidelines.

Question 125: During a transesophageal echocardiogram (TEE), which structure is best visualized in the mid-esophageal four-chamber view?

All four cardiac chambers and AV valves (Correct answer)
Aortic arch
Descending thoracic aorta
Left atrial appendage

Correct answer: All four cardiac chambers and AV valves

The mid-esophageal four-chamber view at approximately 0 degrees displays all four chambers, the mitral valve, tricuspid valve, and interatrial septum simultaneously.

Question 126: During stress echocardiography, which new wall motion abnormality at peak stress is most indicative of significant coronary artery disease?

Stress-induced hypokinesis or akinesis in a coronary territory (Correct answer)
Increased LVEF with exercise
Hyperkinesis in the inferolateral wall
Isolated right ventricular dilation

Correct answer: Stress-induced hypokinesis or akinesis in a coronary territory

New stress-induced regional wall motion abnormality (hypokinesis or akinesis) in a coronary distribution indicates myocardial ischemia due to significant CAD.

Question 127: Which echocardiographic finding is most specific for acute right heart failure secondary to massive pulmonary embolism?

Dilated inferior vena cava without respiratory variation
RV dilation with McConnell sign (akinetic mid free wall with preserved apical contractility) (Correct answer)
Right-to-left shunting across a patent foramen ovale
Tricuspid regurgitation with TR velocity >3 m/s

Correct answer: RV dilation with McConnell sign (akinetic mid free wall with preserved apical contractility)

McConnell sign (regional RV free wall akinesis sparing the apex) has high specificity for acute pulmonary embolism and distinguishes it from other causes of RV pressure overload.

Question 128: A spectral Doppler waveform showing systolic flow above and diastolic flow below the baseline in an arterial study most likely indicates:

Laminar antegrade flow throughout the cycle
Bidirectional flow with forward systole and reverse diastole (triphasic pattern) (Correct answer)
Continuous venous contamination
Severe aliasing artifact

Correct answer: Bidirectional flow with forward systole and reverse diastole (triphasic pattern)

A triphasic arterial waveform shows rapid systolic forward flow, brief early diastolic flow reversal, and then slow antegrade late diastolic flow, characteristic of normal peripheral arteries.

Question 129: On a lower extremity duplex scan, color flow imaging shows aliasing at a focal arterial segment. What is the primary cause of aliasing?

Velocity exceeding the Nyquist limit (Correct answer)
Vessel wall calcification
Improper transducer angle
Venous contamination

Correct answer: Velocity exceeding the Nyquist limit

Aliasing occurs when blood flow velocity exceeds the Nyquist limit (half the pulse repetition frequency), causing color wraparound.

Question 130: Which of the following structures are not viewable from the apical four-chamber view in the trans-thoracic ECHO?

Right atrium
Pulmonary valve (Correct answer)
Right ventricle
Mitral valve

Correct answer: Pulmonary valve

Explanation: <br> The apical four-chamber view in trans-thoracic echocardiography (TTE) allows visualization of the four chambers of the heart: the left atrium, left ventricle, right atrium, and right ventricle. While the mitral valve (option A), right ventricle (option C), and right atrium (option D) are all visible from this view, the pulmonary valve (option B) is not typically visualized in the apical four-chamber view.

Question 131: In duplex evaluation of suspected upper extremity DVT, which vein is MOST commonly affected by catheter-related thrombosis?

Basilic vein at the elbow
Cephalic vein at the shoulder
Subclavian or axillary vein (Correct answer)
Internal jugular vein

Correct answer: Subclavian or axillary vein

Catheter-related upper extremity DVT most commonly involves the subclavian or axillary vein due to central line placement routes.

Question 132: In a patient with a bioprosthetic mitral valve, which Doppler finding should raise concern for prosthetic valve stenosis?

Peak E-wave velocity of 1.4 m/s
Normal pressure half-time of 60 ms
Mean gradient >5–6 mmHg at rest (Correct answer)
Mean gradient <3 mmHg

Correct answer: Mean gradient >5–6 mmHg at rest

A mean gradient exceeding 5–6 mmHg at rest for a mitral bioprosthesis is above the expected normal range and suggests pathologic obstruction requiring further investigation.

Question 133: What happens to the Doppler angle as it approaches 90 degrees relative to blood flow?

Measured velocity increases toward its true value
The PRF must be decreased
Aliasing is eliminated
Measured velocity approaches zero regardless of true velocity (Correct answer)

Correct answer: Measured velocity approaches zero regardless of true velocity

The Doppler equation includes the cosine of the angle; at 90°, cos(90°) = 0, so the detected Doppler shift becomes zero regardless of actual blood velocity.

Question 134: The piezoelectric effect in ultrasound transducers refers to:

Generation of heat from electrical current
Absorption of sound energy by tissue
Conversion of electrical energy to mechanical vibration and vice versa (Correct answer)
Reflection of sound at tissue interfaces

Correct answer: Conversion of electrical energy to mechanical vibration and vice versa

Piezoelectric crystals deform mechanically when voltage is applied (transmit) and generate voltage when mechanically deformed by returning echoes (receive).

Question 135: Which vasoactive agent is used in the cardiac catheterization lab to provoke coronary vasospasm in patients with suspected Prinzmetal (variant) angina?

Isoproterenol
Adenosine
Ergonovine (ergometrine) or acetylcholine (Correct answer)
Nitroprusside

Correct answer: Ergonovine (ergometrine) or acetylcholine

Ergonovine or intracoronary acetylcholine provokes vasospasm in susceptible patients by stimulating smooth muscle contraction, confirming the diagnosis of vasospastic angina.

Question 136: What is the normal resting systemic vascular resistance (SVR) range in dynes·sec·cm⁻⁵?

20–120
2000–3000
100–300
800–1200 (Correct answer)

Correct answer: 800–1200

Normal SVR is approximately 800–1200 dynes·sec·cm⁻⁵, representing the afterload against which the left ventricle pumps.

Question 137: Which of the following is the most common cause of aortic stenosis in patients younger than 70 years in the United States?

Bicuspid aortic valve disease (Correct answer)
Rheumatic disease
Infective endocarditis
Degenerative calcific disease

Correct answer: Bicuspid aortic valve disease

Bicuspid aortic valve, occurring in 1–2% of the population, is the most common cause of aortic stenosis requiring surgery in patients under 70 years of age in developed countries.

Question 138: What is the normal left ventricular ejection fraction (LVEF) range according to American Society of Echocardiography (ASE) guidelines?

40–50%
45–55%
60–70%
≥55% (Correct answer)

Correct answer: ≥55%

ASE guidelines define normal LVEF as ≥55%, with mildly reduced EF at 41–54%, moderately reduced at 30–40%, and severely reduced at <30%.

Question 139: Which class of antiarrhythmic drugs blocks sodium channels and is classified as Class I according to the Vaughan Williams classification?

Potassium channel blockers (e.g., amiodarone)
Sodium channel blockers (e.g., lidocaine, flecainide) (Correct answer)
Calcium channel blockers (e.g., verapamil)
Beta-blockers (e.g., metoprolol)

Correct answer: Sodium channel blockers (e.g., lidocaine, flecainide)

Vaughan Williams Class I antiarrhythmics (e.g., lidocaine, flecainide, procainamide) block fast sodium channels, slowing phase 0 depolarization and conduction velocity.

Question 140: Which echocardiographic parameter best reflects the hemodynamic significance of mitral regurgitation?

Peak regurgitant velocity
Pulmonary vein systolic flow reversal alone
Effective regurgitant orifice area (EROA) (Correct answer)
Color Doppler jet area

Correct answer: Effective regurgitant orifice area (EROA)

EROA quantifies the size of the regurgitant orifice independent of driving pressure, making it the most accurate single parameter for MR severity grading.

Question 141: In a patient with right bundle branch block (RBBB), which lead typically shows the classic RSR' (rabbit ears) pattern?

V1 (Correct answer)
aVF
Lead I
V5

Correct answer: V1

RBBB produces a wide QRS with a characteristic RSR' (M-shaped or 'rabbit ear') pattern in lead V1 due to delayed right ventricular activation.

Question 142: The ICA/CCA PSV ratio is used to grade ICA stenosis; a ratio greater than what value correlates with ≥70% stenosis by NASCET criteria?

1.5
2.0
4.0 (Correct answer)
3.0

Correct answer: 4.0

An ICA/CCA PSV ratio >4.0 is consistent with ≥70% ICA stenosis per the Society of Radiologists in Ultrasound consensus.

Question 143: Which patient would be LEAST appropriate for a standard symptom-limited maximal exercise treadmill test without imaging?

55-year-old male with prior CABG and baseline LBBB on ECG (Correct answer)
50-year-old with hypertension referred for preoperative cardiac clearance
60-year-old female with typical angina and normal baseline ECG
45-year-old male with atypical chest pain and normal resting ECG

Correct answer: 55-year-old male with prior CABG and baseline LBBB on ECG

LBBB on baseline ECG causes false-positive ST changes during exercise, making ECG-only stress testing uninterpretable and necessitating imaging adjuncts.

Question 144: Which of the following correctly describes the Frank-Starling mechanism of the heart?

Increased stretch of the ventricular myocardium leads to a more forceful contraction. (Correct answer)
The force of ventricular contraction is independent of the end-diastolic volume.
Increased heart rate leads to a proportional increase in stroke volume.
Hormonal stimulation is required to match cardiac output to venous return.

Correct answer: Increased stretch of the ventricular myocardium leads to a more forceful contraction.

The Frank-Starling law states that the stroke volume of the heart increases in response to an increase in the volume of blood filling the ventricles (the end-diastolic volume). When a larger volume of blood stretches the ventricular muscle fibers, it leads to a more forceful contraction, thereby increasing the stroke volume. This is an intrinsic property of the heart muscle.

Question 145: Increasing the gain on an ultrasound system primarily affects:

The depth of field
The amplification of returning echo signals (Correct answer)
The frequency of transmitted pulses
The pulse repetition frequency

Correct answer: The amplification of returning echo signals

Gain uniformly amplifies all returning echo signals electronically without changing transmission power or depth penetration.

Question 146: In order to determine the proper location in the image memory for each echo, which of the following would be considered correct?

The direction of the electrodes
The grayscale
The location of echoes in depth down each scan line (Correct answer)
None of the above

Correct answer: The location of echoes in depth down each scan line

Explanation: <br> To determine the proper location in the image memory for each echo, it's essential to consider the depth at which each echo is received along the scan lines. This helps in reconstructing the spatial information of the imaged structures accurately. Grayscale (option A) relates to the brightness of the pixels in the image and is not directly related to spatial location. The direction of the electrodes (option C) is unrelated to echo location in the image memory. Therefore, option B is the correct choice.

Question 147: A patient has a peak aortic valve gradient of 52 mmHg with an AVA of 0.9 cm² but an LVEF of 30%. How should this be classified?

Low-flow, low-gradient severe AS (Correct answer)
Pseudosevere aortic stenosis
Moderate aortic stenosis
High-gradient severe AS

Correct answer: Low-flow, low-gradient severe AS

Reduced stroke volume from low EF produces low gradients despite true severe stenosis, classifying this as low-flow, low-gradient severe AS requiring dobutamine stress echo for confirmation.

Question 148: Increasing pulse repetition frequency (PRF) in pulsed wave Doppler will:

Increase the Nyquist limit, allowing measurement of higher velocities before aliasing (Correct answer)
Increase maximum measurable depth
Decrease the Doppler shift
Reduce temporal resolution

Correct answer: Increase the Nyquist limit, allowing measurement of higher velocities before aliasing

Higher PRF means more samples per second; since the Nyquist limit = PRF/2, higher PRF raises the aliasing threshold and allows measurement of faster velocities.

Question 149: Which echocardiographic view best demonstrates the left ventricular outflow tract (LVOT) for velocity measurement by pulsed-wave Doppler?

Parasternal short-axis at the aortic valve level
Subcostal four-chamber view
Apical five-chamber view (Correct answer)
Parasternal long-axis with posterior angulation

Correct answer: Apical five-chamber view

The apical five-chamber view aligns the Doppler beam parallel to LVOT flow, minimizing the angle of incidence for accurate velocity measurement.

Question 150: When assessing for vertebral artery occlusion, which finding would support the diagnosis?

High-resistance biphasic waveform with preserved systolic flow
Absent color flow and Doppler signal despite optimal technique (Correct answer)
Retrograde flow with augmentation during arm hyperemia
Normal antegrade low-resistance flow at V2

Correct answer: Absent color flow and Doppler signal despite optimal technique

Absent flow signal with proper technique and confirmed vertebral artery visualization on B-mode is indicative of vertebral artery occlusion.

Question 151: The 'TIMI flow grade' system classifies coronary blood flow from 0 to 3. TIMI 2 is defined as:

Complete perfusion — contrast fills and clears normally
Partial perfusion — contrast passes but fills and clears the distal vessel slowly (Correct answer)
Delayed but complete filling within 3 beats
No perfusion — contrast does not pass beyond the obstruction

Correct answer: Partial perfusion — contrast passes but fills and clears the distal vessel slowly

TIMI 2 indicates partial reperfusion: contrast does opacify the distal vessel but clearing is slower than in an unobstructed artery.

Question 152: In atrial flutter, what is the typical atrial rate (flutter wave rate)?

150–200 bpm
350–450 bpm
250–350 bpm (Correct answer)
100–150 bpm

Correct answer: 250–350 bpm

Typical (type I) atrial flutter has an atrial rate of 250–350 bpm producing characteristic sawtooth flutter waves, most visible in inferior leads.

Question 153: The acceleration time (AT) measured in intrarenal arteries is prolonged when:

There is an intrarenal arteriovenous malformation
Renal vein thrombosis is present
There is significant proximal renal artery stenosis (Correct answer)
The patient is dehydrated

Correct answer: There is significant proximal renal artery stenosis

Significant renal artery stenosis dampens the waveform, prolonging the time from onset of systole to peak systolic velocity (AT > 70–80 ms).

Question 154: A duplex ultrasound of the vertebral arteries reveals sustained retrograde (reversed) flow in the left vertebral artery. This finding is a classic sign of which condition?

Stenosis of the right brachiocephalic artery
High-grade stenosis of the left internal carotid artery
Occlusion or high-grade stenosis of the proximal left subclavian artery (Correct answer)
Occlusion of the basilar artery

Correct answer: Occlusion or high-grade stenosis of the proximal left subclavian artery

Sustained retrograde flow in a vertebral artery is the hallmark of subclavian steal syndrome. This occurs when there is a severe stenosis or occlusion in the subclavian artery proximal to the origin of the vertebral artery. [9, 20] The pressure drop in the arm causes blood to flow down the vertebral artery (in a reverse direction) to supply the ischemic arm, 'stealing' it from the cerebral circulation. [9, 24]

Question 155: Which drug class is contraindicated in patients with severe aortic stenosis when treating systemic hypertension due to risk of hemodynamic collapse?

Beta-blockers
Potent vasodilators such as hydralazine or nitroprusside (Correct answer)
Dihydropyridine calcium channel blockers (e.g., amlodipine)
ACE inhibitors

Correct answer: Potent vasodilators such as hydralazine or nitroprusside

Potent arterial vasodilators are relatively contraindicated in severe aortic stenosis because the fixed outflow obstruction prevents compensatory increase in cardiac output, causing sudden hypotension.

Question 156: What is the significance of a U wave on the ECG?

It represents atrial repolarization
It often indicates hypokalemia when prominent (Correct answer)
It signifies complete ventricular depolarization
It is always pathological

Correct answer: It often indicates hypokalemia when prominent

Prominent U waves are a classic ECG sign of hypokalemia; they appear after the T wave and can mimic a prolonged QT interval.

Question 157: What does an E/A ratio greater than 2 with a short deceleration time indicate in Doppler assessment of mitral inflow?

Normal diastolic function
Grade I diastolic dysfunction (impaired relaxation)
Grade III restrictive diastolic dysfunction (Correct answer)
Pseudonormal filling pattern

Correct answer: Grade III restrictive diastolic dysfunction

An E/A ratio >2 with a deceleration time <160 ms indicates Grade III (restrictive) diastolic dysfunction, suggesting elevated filling pressures.

Question 158: Which color Doppler finding suggests severe mitral regurgitation?

Trace regurgitation with normal mitral inflow velocities
Small central color jet <20% of left atrial area
Eccentric wall-hugging jet with vena contracta >7 mm (Correct answer)
Mild turbulence at the mitral annulus

Correct answer: Eccentric wall-hugging jet with vena contracta >7 mm

Severe MR is suggested by an eccentric, wall-hugging Coanda jet and vena contracta width >7 mm, as central jet area alone underestimates severity of eccentric jets.

Question 159: During coronary angiography, a 'damping' of the pressure waveform in the guide catheter most likely indicates:

Catheter tip occlusion of the coronary ostium (Correct answer)
Ventricular fibrillation
Air in the manifold system
Vasospasm distal to the tip

Correct answer: Catheter tip occlusion of the coronary ostium

Damping occurs when the catheter tip obstructs coronary flow, reducing the pulsatile pressure signal and risking ischemia or dissection.

Question 160: During a carotid evaluation, the sonographer observes a low-velocity, delayed systolic upstroke, and rounded systolic peak in the left Common Carotid Artery (CCA). This waveform morphology, known as 'tardus parvus,' suggests a significant stenosis in which location?

Left Internal Carotid Artery (ICA)
Right Common Carotid Artery (CCA)
Left Subclavian or Brachiocephalic Artery (Correct answer)
Left Vertebral Artery

Correct answer: Left Subclavian or Brachiocephalic Artery

A 'tardus parvus' waveform indicates the dampening effect of a significant stenosis or occlusion proximal (upstream) to the point of sampling. [14, 19] Since the waveform is observed in the left CCA, the flow obstruction must be located more proximally, such as in the left subclavian artery or the brachiocephalic (innominate) artery, which gives rise to the right-sided vessels. [8, 16]

Question 161: A patient's ECG shows a regular rhythm at 150 bpm with narrow QRS complexes and no visible P waves. Which rhythm is most likely?

Sinus tachycardia
Atrial flutter with 2:1 block (Correct answer)
Ventricular tachycardia
Accelerated junctional rhythm

Correct answer: Atrial flutter with 2:1 block

Atrial flutter typically produces a ventricular rate of 150 bpm when 2:1 AV conduction is present, often hiding flutter waves in the QRS or T wave.

Question 162: What is the primary indication for using adenosine during cardiac catheterization for fractional flow reserve (FFR) measurement?

To reverse the effect of heparin anticoagulation
To treat contrast-induced allergic reactions
To increase heart rate and detect wall motion abnormalities
To induce maximal coronary hyperemia for accurate pressure gradient measurement (Correct answer)

Correct answer: To induce maximal coronary hyperemia for accurate pressure gradient measurement

Adenosine induces maximal coronary hyperemia by maximally dilating the coronary microvasculature, which is required to accurately calculate FFR from the pressure gradient across a stenosis.

Question 163: What is the normal duration of the QRS complex in adults?

0.20–0.28 seconds
0.04–0.06 seconds
0.12–0.20 seconds
0.06–0.10 seconds (Correct answer)

Correct answer: 0.06–0.10 seconds

A normal QRS complex measures 0.06–0.10 seconds (60–100 ms); a duration ≥0.12 seconds is considered abnormally wide.

Question 164: A patient undergoes an echocardiogram for evaluation of a heart murmur. The results show a peak aortic valve velocity of 4.5 m/s, a mean pressure gradient of 50 mmHg, and a calculated aortic valve area of 0.9 cm². According to current guidelines, how would this aortic stenosis be classified?

Critical
Severe (Correct answer)
Mild
Moderate

Correct answer: Severe

According to the American College of Cardiology/American Heart Association (ACC/AHA) and European Society of Cardiology (ESC) guidelines, severe aortic stenosis is defined by a peak velocity >4 m/s, a mean gradient >40 mmHg, and an aortic valve area <1.0 cm². This patient's findings all fall within the 'severe' category.

Question 165: Which vein is evaluated at the popliteal fossa to assess for small saphenous vein (SSV) termination?

Gastrocnemial vein junction
Saphenopopliteal junction (SPJ) (Correct answer)
Tibial-peroneal trunk junction
Soleal vein confluence

Correct answer: Saphenopopliteal junction (SPJ)

The saphenopopliteal junction (SPJ) is the site where the small saphenous vein drains into the popliteal vein, and its exact level is variable.

Question 166: When engaging the left main coronary artery with a catheter, the pressure waveform abruptly changes, showing a sharp drop in diastolic pressure and a morphology that resembles a left ventricular tracing. This dangerous phenomenon, known as 'ventricularization,' is a critical sign of what?

Severe mitral stenosis
Severe aortic regurgitation
Successful passage into the left ventricle
Significant left main coronary artery stenosis (Correct answer)

Correct answer: Significant left main coronary artery stenosis

Ventricularization of the pressure waveform occurs when the tip of the catheter partially or fully occludes a significant stenosis at the ostium of the left main coronary artery. [11, 21, 23] The catheter tip is now recording the post-stenotic pressure, which is low and mimics the LV waveform, while simultaneously causing ischemia by blocking flow. This is a critical warning sign requiring immediate catheter withdrawal. [23, 26]

Question 167: When scanning the popliteal fossa from a posterior approach, what is the typical anatomical relationship between the popliteal vein and the popliteal artery on the ultrasound screen?

The artery is not visible in this view
The vein is superficial (closer to the transducer) to the artery (Correct answer)
The vein is lateral to the artery
The vein is deep (further from the transducer) to the artery

Correct answer: The vein is superficial (closer to the transducer) to the artery

When imaging from the posterior aspect of the knee (the popliteal fossa), the popliteal vein is typically located superficial to the popliteal artery. Therefore, on the ultrasound display, the vein will appear closer to the top of the screen than the artery.

Question 168: Which measurement on M-mode echocardiography is used to calculate fractional shortening (FS)?

LV end-diastolic and end-systolic volumes
Left atrial and aortic root dimensions
LV posterior wall and septal thicknesses
LV end-diastolic and end-systolic internal dimensions (Correct answer)

Correct answer: LV end-diastolic and end-systolic internal dimensions

FS = (LVIDd – LVIDs) ÷ LVIDd × 100%, using M-mode LV internal dimensions at end-diastole and end-systole.

Question 169: During right heart catheterization, the oxygen saturation step-up from the right atrium to the right ventricle suggests which condition?

Ventricular septal defect (VSD) with left-to-right shunt (Correct answer)
Pulmonary hypertension
Tricuspid regurgitation
Aortic regurgitation

Correct answer: Ventricular septal defect (VSD) with left-to-right shunt

An oxygen saturation step-up at the RV level indicates oxygenated blood shunting from the left ventricle to the right ventricle through a ventricular septal defect.

Question 170: In severe aortic stenosis, which hemodynamic finding indicates the poorest prognosis without intervention?

Syncope with exertion (Correct answer)
Mild concentric LV hypertrophy
Asymptomatic with AVA 0.95 cm²
Peak gradient of 40 mmHg

Correct answer: Syncope with exertion

The classic triad of symptoms in AS (angina, syncope, heart failure) signals decompensation; exertional syncope carries a mean survival of approximately 3 years without valve replacement.

Question 171: What is the Wilkins score used to assess?

Risk of aortic valve repair failure
Tricuspid regurgitation etiology
Severity of aortic stenosis
Suitability of mitral valve for percutaneous balloon mitral valvuloplasty (Correct answer)

Correct answer: Suitability of mitral valve for percutaneous balloon mitral valvuloplasty

The Wilkins score grades mitral leaflet mobility, thickening, calcification, and subvalvular thickening (0–16); a score ≤8 predicts good outcome with percutaneous balloon mitral valvuloplasty.

Question 172: During percutaneous coronary intervention, a coronary dissection that involves the coronary media and results in reduced TIMI flow is classified as NHLBI type:

Type E or F (Correct answer)
Type B
Type D
Type A

Correct answer: Type E or F

NHLBI types E and F dissections involve spiral luminal filling defects or total occlusions with no distal flow, representing the most severe dissection categories.

RCS – Registered Cardiac Sonographer (CCI)

The RCS exam, administered by Cardiovascular Credentialing International (CCI), certifies cardiac sonographers who perform echocardiographic procedures and evaluate cardiovascular anatomy, physiology, and hemodynamics.

170

Questions

180 min

Time Limit

70%

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