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Doppler Echocardiography Flashcards

6 cards from real ARDMS ECHO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Doppler Echocardiography flashcards as text

  1. Which hepatic vein Doppler pattern indicates severe tricuspid regurgitation?

    Answer: Systolic flow reversal in hepatic veins

    Severe TR causes systolic flow reversal in the hepatic veins as the regurgitant volume raises right atrial pressure during systole.

  2. What is the Nyquist limit, and how can aliasing be corrected on color Doppler?

    Answer: Maximum detectable velocity (½ PRF); corrected by increasing PRF or using CW Doppler

    The Nyquist limit is the maximum velocity detectable by PW/color Doppler (½ PRF); aliasing is corrected by increasing PRF, shifting baseline, or switching to CW Doppler.

  3. Tissue Doppler e' velocity at the septal annulus is normally:

    Answer: >8 cm/s

    Normal septal e' velocity is ≥7–8 cm/s; a value <7 cm/s suggests impaired myocardial relaxation.

  4. Which Doppler waveform is used to assess diastolic function in patients with atrial fibrillation?

    Answer: Mitral E wave deceleration time and E/e' ratio

    In AF where the A wave is absent, diastolic function is assessed using mitral E-wave deceleration time and E/e' ratio.

  5. What does a 'W-shaped' M-mode tracing of the mitral valve indicate?

    Answer: Normal mitral valve motion

    The normal M-mode mitral valve tracing shows a W-shaped pattern reflecting two opening excursions (E and A waves) in diastole.

  6. In a patient with suspected cardiac tamponade, which Doppler finding is most specific?

    Answer: Respiratory variation >25% in mitral E velocity and >40% in tricuspid E velocity

    Cardiac tamponade is characterized by exaggerated respiratory variation: >25% decrease in mitral inflow and >40% increase in tricuspid inflow on inspiration.