Case 8 — Doppler

Continuous wave Doppler tracing with the beam crossing flow across the defect at the base of the interventricular septum. Low-velocity flow at 1.66 m/s is recorded during diastole and higher-velocity flow at 3.41 m/s during systole. Both flows are toward the transducer. Pressure gradients (PG) calculated from peak velocities are shown on the image.
Continuous wave Doppler across the interventricular septal defect. Diastolic flow: 1.66 m/s; systolic flow: 3.41 m/s. Both flows are toward the transducer. Pressure gradients are shown on the image.

Quiz

1. The relatively low velocity flow across this region tells you what?

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