Peripheral Vascular Assessment Flashcards
7 cards from real CVT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Peripheral Vascular Assessment flashcards as text
Which waveform characteristic on a peripheral arterial Doppler study is most indicative of a hemodynamically significant proximal stenosis?
Answer: Monophasic waveform with prolonged systolic upstroke and absent diastole
A monophasic waveform with a prolonged systolic upstroke (tardus-parvus pattern) distal to a stenosis indicates significant proximal arterial obstruction.
During venous duplex imaging of the lower extremity, which maneuver is used to assess valve competence?
Answer: Valsalva maneuver
The Valsalva maneuver increases intra-abdominal pressure, temporarily halting venous flow, and upon release reveals reflux in incompetent valves.
What is the normal duration threshold for pathologic venous reflux in the great saphenous vein?
Answer: Greater than 0.5 seconds
Reflux duration exceeding 0.5 seconds in the great saphenous vein is considered pathologic and indicative of valvular incompetence.
A patient presents with acute limb ischemia. Which of the '6 P's' is considered the most urgent sign requiring immediate intervention?
Answer: Paralysis
Paralysis (motor deficit) indicates advanced ischemia with muscle and nerve involvement, requiring emergent revascularization to prevent irreversible limb loss.
When performing a renal artery duplex study, a peak systolic velocity (PSV) ratio of the renal artery to the aorta (RAR) greater than what value indicates significant renal artery stenosis?
Answer: 3.5
A renal-aortic ratio (RAR) greater than 3.5 is the standard threshold for diagnosing hemodynamically significant renal artery stenosis.
In a patient with suspected subclavian steal syndrome, which finding on duplex ultrasound confirms the diagnosis?
Answer: Retrograde or bidirectional flow in the ipsilateral vertebral artery
Subclavian steal syndrome is confirmed by retrograde or bidirectional (to-and-fro) flow in the vertebral artery ipsilateral to the subclavian stenosis or occlusion.
Which Doppler angle should be used when obtaining velocity measurements in peripheral vascular studies to ensure accuracy?
Answer: 60 degrees or less
Doppler angles of 60 degrees or less are required for accurate velocity measurements; angles greater than 60 degrees introduce significant cosine error.