CCI RCS 3 โ Questions and Answers
Question 1: During a transesophageal echocardiogram, at approximately what depth (omniplane angle ~0ยฐ) is the four-chamber view typically obtained?
- 20โ25 cm from incisors
- 30โ35 cm from incisors (Correct answer)
- 40โ45 cm from incisors
- 15โ20 cm from incisors
Correct answer: 30โ35 cm from incisors
The midesophageal four-chamber view is obtained with the probe approximately 30โ35 cm from the incisors at 0โ20ยฐ omniplane angle.
Question 2: The continuity equation for aortic valve area (AVA) is: AVA = (LVOT area ร LVOT VTI) รท AV VTI. Which measurement is most susceptible to error due to geometric assumptions?
- Aortic valve VTI
- LVOT VTI
- LVOT diameter (Correct answer)
- Peak aortic jet velocity
Correct answer: LVOT diameter
LVOT area is calculated as ฯ(d/2)ยฒ, so any error in the LVOT diameter is squared, making it the dominant source of error in the continuity equation.
Question 3: A patient presents with hypotension, jugular venous distension, and muffled heart sounds. The echocardiogram shows right ventricular diastolic collapse. What is the diagnosis?
- Tension pneumothorax
- Cardiac tamponade (Correct answer)
- Constrictive pericarditis
- Acute pulmonary embolism
Correct answer: Cardiac tamponade
Right atrial systolic collapse and RV diastolic collapse are the most specific echocardiographic signs of hemodynamically significant cardiac tamponade.
Question 4: Which echocardiographic parameter BEST distinguishes constrictive pericarditis from restrictive cardiomyopathy?
- Mitral inflow E/A ratio
- Respiratory variation in mitral E velocity >25% with septal bounce (Correct answer)
- 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 5: Which finding is MOST consistent with severe aortic regurgitation on continuous-wave Doppler?
- Pressure half-time >500 ms
- Pressure half-time <250 ms (Correct answer)
- Peak regurgitant velocity <2 m/s
- Holodiastolic flow reversal absent in the descending aorta
Correct answer: Pressure half-time <250 ms
A short pressure half-time (<250 ms) indicates rapid equalization of aortic and LV diastolic pressures, consistent with severe aortic regurgitation.
Question 6: In hypertrophic obstructive cardiomyopathy (HOCM), systolic anterior motion (SAM) of the mitral valve results from which mechanism?
- Flail anterior mitral leaflet due to chordal rupture
- Venturi effect drawing the mitral leaflet toward the septum during systole (Correct answer)
- Prolapse of the posterior mitral leaflet into the left atrium
- 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 7: Which artifact on echocardiography is caused by two strong specular reflectors and produces a false image at twice the true depth of a structure?
- Side-lobe artifact
- Reverberation artifact (Correct answer)
- Acoustic shadowing
- Near-field clutter
Correct answer: Reverberation artifact
Reverberation artifacts occur when the ultrasound beam bounces repeatedly between two strong reflectors, generating false echoes at multiples of the true depth.
CCI RCS 3
During a transesophageal echocardiogram, at approximately what depth (omniplane angle ~0ยฐ) is the four-chamber view typically obtained?