In a patient with congestive heart failure, what is typically seen in calf vein Doppler flow?

• A. Absence of spontaneous flow
• B. Continuous forward flow with normal velocity
• C. Pulsatile venous flow
• D. Reversed flow during expiration

Answer: (A)

In lower-extremity venous Doppler, what you see in the calf veins reflects how well venous return is progressing from the legs back to the heart. In congestive heart failure, central venous pressure is elevated and cardiac output is reduced, so forward flow into the peripheral venous system is dampened. That tends to produce little or no spontaneous flow in the calf veins at rest because the system isn’t being driven forward as it normally would be. You may still be able to elicit flow with distal compression, but without obstruction or local valve failure, the baseline pattern is one of diminished, often absent, spontaneous flow.

This is different from a normal, healthy pattern where spontaneous forward flow is present even before any augmentation, and from patterns that imply other issues such as a pulsatile waveform from transmitted arterial pulsations or a flow reversal with respiration, which are not the typical baseline finding in CHF of the calf veins.