In a patient with congestive heart failure, what would you expect in calf veins on Doppler?

• A. Absence of spontaneous flow
• B. Normal spontaneous forward flow
• C. Continuous high-velocity flow
• D. Pulsatile venous flow

Answer: (A)

In leg venous Doppler, the presence and character of flow in calf veins reflect how well blood is returning through the venous system and how much right-sided heart pressure is transmitted back to the peripheral veins. In congestive heart failure, especially with elevated central venous pressure, venous return is impaired and venous stasis develops in the distal veins. This often leads to a Doppler signal that is markedly reduced or even absent—that is, a lack of spontaneous forward flow in the calf veins. The blood isn’t being propelled forward effectively, so the baseline flow can disappear.

Normal spontaneous forward flow would imply adequate venous return and no substantial venous congestion, which isn’t expected in this setting. Continuous high-velocity flow would suggest an abnormal arteriovenous shunt rather than a congested venous system. Pulsatile venous flow can occur with marked right-heart movement transmitted into large veins, but in routine calf vein Doppler of congestive states, the more characteristic finding is diminished or absent spontaneous flow due to venous stasis from elevated venous pressures.