Mixed Deck — All EKG certification Certification Topics Flashcards

Which EKG finding is characteristic of atrial fibrillation?

Answer: Irregularly irregular R-R intervals with absent P waves

Atrial fibrillation is identified by an irregularly irregular ventricular rhythm with no discernible P waves replaced by fibrillatory waves.

Which of the following describes depolarization of the ventricular muscle?

Answer: QRS complex

The QRS complex on an ECG represents the rapid electrical depolarization of the ventricles. This significant electrical event immediately precedes and triggers the contraction of the ventricular muscle. Ventricular contraction is essential for pumping blood out of the heart to the lungs and the rest of the body.

Which EKG finding is characteristic of Wolff-Parkinson-White (WPW) syndrome?

Answer: Delta wave with shortened PR interval

WPW syndrome is identified by a delta wave (slurred upstroke of the QRS), shortened PR interval, and widened QRS complex due to an accessory pathway.

Which method is most accurate for calculating heart rate on an EKG strip with an irregular rhythm?

Answer: Count R waves in a 6-second strip and multiply by 10

The 6-second method is preferred for irregular rhythms because it averages the rate over multiple beats rather than relying on a single R-R interval.

What is the function of the sinoatrial (SA) node in the heart?

Answer: It regulates the heart’s electrical activity.

The sinoatrial (SA) node, often called the heart's natural pacemaker, is a specialized cluster of cells located in the right atrium. Its primary function is to generate electrical impulses that initiate each heartbeat, setting the rhythm and rate of the heart's contractions. This electrical activity then spreads through the heart, coordinating the pumping action of the atria and ventricles.

Which of these conditions has a connection to the T waves in the brain?

Answer: Intracranial bleed

Intracranial bleeds can significantly impact the brain's autonomic nervous system, leading to characteristic EKG changes. These changes often manifest as deeply inverted or giant T waves, sometimes called 'cerebral T waves,' which are distinct from those caused by cardiac ischemia. This phenomenon is thought to be mediated by increased intracranial pressure and sympathetic overactivity affecting myocardial repolarization.

A technician places the right leg electrode during a 12-lead EKG. What is the primary function of this electrode?

Answer: It acts as an electrical ground to reduce interference

The right leg (RL) electrode serves as the electrical ground for the entire recording. It does not contribute to any of the 12 leads but helps minimize electrical interference and artifact in the tracing.

A patient presents with an irregularly irregular rhythm with no discernible P waves on EKG. What is the most likely diagnosis?

Answer: Atrial fibrillation

Atrial fibrillation is characterized by an irregularly irregular rhythm with fibrillatory baseline and absence of organized P waves.

The heart pumps the following amount of blood into the aorta each minute:

Answer: Cardiac output

Cardiac output is the volume of blood pumped by the heart into the aorta each minute. It is calculated by multiplying the heart rate (beats per minute) by the stroke volume (the amount of blood pumped out with each beat). This measurement is a key indicator of the heart's efficiency in delivering blood to the body's tissues.

How many small boxes on standard EKG paper equal 1 millivolt of amplitude?

Answer: 10 small boxes

At standard calibration of 10 mm/mV, 1 millivolt equals 10 small boxes or 2 large boxes in height.

Which of the following describes the function of a right leg (RL/N) electrode in a 12-lead EKG?

Answer: It serves as a ground electrode to reduce electrical interference

The right leg electrode acts as a ground (neutral) electrode that helps cancel out electrical noise and interference, improving signal quality.

During ECG acquisition, the technician notices the baseline is wandering up and down slowly on the tracing. What is the most common cause of this artifact?

Answer: Loose or dried electrode gel causing poor skin contact

Baseline wander is most commonly caused by poor electrode contact due to dried gel, loose leads, or inadequate skin preparation. It produces a slow undulating shift of the baseline that can obscure ST-segment analysis.

An EKG shows a regular wide-complex tachycardia at 180 bpm with AV dissociation. What is the most likely rhythm?

Answer: Ventricular tachycardia

A regular wide-complex tachycardia with AV dissociation strongly suggests ventricular tachycardia rather than a supraventricular origin.

During a cardiac stress test, what is the primary reason for monitoring the ST segment on the EKG?

Answer: To detect exercise-induced myocardial ischemia

ST segment depression during exercise is the hallmark EKG finding that indicates myocardial ischemia due to inadequate coronary blood flow.

Which group of leads on a 12-lead EKG is best used to detect ischemia or injury to the anterior wall of the left ventricle?

Answer: V1, V2, V3, and V4

Leads V1 through V4 overlie the anterior surface of the heart and are therefore the primary leads for detecting anterior wall ischemia, injury, or infarction. Changes such as ST elevation or T-wave inversion in these leads point to anterior wall involvement.

What is the importance of EKG Interpretation & Waveforms in EKG certification?

Answer: It is crucial for understanding the heart's electrical activity and ensuring accurate results.

EKG interpretation and waveform analysis are fundamental to understanding the heart's electrical activity. This crucial skill allows medical professionals to accurately read and make sense of the complex patterns on an EKG tracing. Without proper interpretation, the EKG results cannot be effectively used for diagnosis or patient management, making it essential for accurate results.

How does Safety & Infection Control Protocols affect the diagnosis of heart conditions?

Answer: It plays a significant role in identifying abnormal heart rhythms and other cardiac conditions.

Safety & Infection Control Protocols are foundational for creating a sterile and secure environment necessary for diagnostic procedures. By minimizing risks of contamination or patient harm, these protocols ensure that EKG tests can be performed reliably and without interruption. This reliability is vital for obtaining accurate data, which in turn allows healthcare professionals to correctly identify abnormal heart rhythms and other cardiac conditions.

How does Heart Rate & Rhythm Analysis affect patient outcomes?

Answer: It has a long-term impact on improving heart health and preventing complications.

By accurately identifying and monitoring heart conditions, Heart Rate & Rhythm Analysis enables early and precise medical intervention. This proactive management helps prevent the progression of heart disease and reduces the risk of serious complications like heart attacks or strokes. Consequently, it has a profound long-term impact on maintaining and improving a patient's overall heart health.

What is the significance of a drop in systolic blood pressure greater than 10 mmHg during an exercise stress test despite increasing workload?

Answer: It suggests severe coronary artery disease or left ventricular dysfunction

An exercise-induced drop in systolic blood pressure indicates the heart cannot increase cardiac output appropriately, suggesting severe CAD or pump failure.

An EKG cable set has visible dried secretions on it after use. What is the correct next step?

Answer: Wipe with a facility-approved disinfectant wipe and allow full contact time before reuse

Reusable EKG cables must be cleaned with an EPA-registered, facility-approved disinfectant and allowed the full recommended contact (dwell) time to inactivate pathogens. Autoclaving damages the cables, and discarding reusable equipment is unnecessary if proper disinfection is performed.