What is the expected Doppler signal from the subclavian vein?

The expected Doppler signal from the subclavian vein is typically characterized as pulsatile. This pulsatility is primarily due to the influence of adjacent arterial flow, particularly from the subclavian artery, which transmits its pulsation to the surrounding veins. The subclavian vein is located close to this artery and thus reflects the arterial waveforms, resulting in a Doppler signal that demonstrates variations in flow consistent with the heart's pumping action.

In contrast, continuous and non-pulsatile signals would indicate a different type of blood flow, often associated with venous conditions or pathologies. A steady signal is often less commonly observed in this context, as it does not account for the dynamic nature of venous flow influenced by the heartbeat. The pulsatile signal observed in the subclavian vein is significant for assessing normal venous function and is an important aspect in diagnosing potential vascular issues.