Case 37

Continuous wave Doppler echocardiogram

From a left apical view, a CW Doppler cursor was placed across the left ventricular outflow tract (LVOT) and aorta and this recording of peak blood flow velocity was made. The peak velocity was measured (green box in upper right corner).

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Quiz

1. The ultrasound machine has converted the peak velocity of the jet through the lesion (4.94 m/s) to a pressure gradient across the lesion to be 97.6 mmHg. What formula did it use?

Pi times radius squared times velocity

Velocity times the square root of 6

Velocity squared times four

The formula is too long to fit on this screen.

2. The velocity and pressure gradient mean the lesion in this dog is:

Trivial

Mild

Moderate

Severe

Check Answer