Case Studies In Small Animal

Cardiovascular Medicine

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Case 13

Spectral Doppler (Continuous Wave)

cw.jpg (37442 bytes)

This is a continuous wave Doppler tracing taken from the dog using a transesophageal probe while the dog was anesthetized. The probe is in the esophagus, dorsal to the heart and the flow is traveling toward the transducer. Hence, the signal is above the line. The continuous wave Doppler cursor has been placed across the right ventricular outflow tract and main pulmonary artery in the turbulent jet. The peak velocity (V) in systole is increased to 5.69 (5.7) meters/second which translates into the pressure gradient (PG) of 129 mm Hg. There is 60-cycle interference on the ECG trace.

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Mark D. Kittleson, D.V.M., Ph.D. All rights reserved.