Diagnostic Testing & Imaging Flashcards
7 cards from real CCS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Diagnostic Testing & Imaging flashcards as text
Which echocardiographic Doppler pattern is most consistent with constrictive pericarditis rather than restrictive cardiomyopathy?
Answer: Exaggerated respiratory variation in mitral inflow E velocity >25%
Constrictive pericarditis shows >25% respiratory variation in mitral E velocity due to ventricular interdependence, while restrictive cardiomyopathy typically does not.
A patient undergoes adenosine stress MRI. Which finding on first-pass perfusion imaging indicates significant ischemia?
Answer: Subendocardial perfusion deficit during stress that resolves at rest
A stress-induced subendocardial perfusion deficit that normalizes at rest indicates reversible ischemia in that coronary territory.
On a coronary angiogram, TIMI 3 flow is defined as:
Answer: Complete perfusion with normal flow distal to the lesion
TIMI 3 represents complete and normal antegrade flow through the coronary artery, equivalent to normal coronary flow.
Which finding on ankle-brachial index (ABI) testing is diagnostic of peripheral arterial disease?
Answer: ABI ≤0.90 at rest
An ABI ≤0.90 is the accepted threshold for diagnosing PAD, reflecting reduced perfusion pressure in the lower extremities.
In cardiac electrophysiology, which measurement during an EP study indicates dual AV nodal physiology?
Answer: A jump ≥50ms in the AH interval with a 10ms decrement in atrial coupling interval
A sudden jump of ≥50ms in the AH interval when the atrial extrastimulus is shortened by 10ms indicates switching from the fast to slow AV nodal pathway.
Which CT finding is most suggestive of pulmonary embolism on computed tomography pulmonary angiography (CTPA)?
Answer: Filling defect within the pulmonary artery with contrast surrounding the thrombus
An intraluminal filling defect surrounded by contrast on CTPA is the direct sign of pulmonary embolism, representing thrombus within the vessel.
A patient with known WPW syndrome undergoes an EP study. Which measurement predicts the highest risk of sudden cardiac death?
Answer: Shortest pre-excited RR interval ≤250ms during atrial fibrillation
A shortest pre-excited RR interval ≤250ms during induced or spontaneous AF indicates an accessory pathway capable of rapidly conducting to the ventricles, risking VF.