Page 55 - Virtual Vascular Vol 5

Vascular Lab Video: CW Doppler

Artery and vein doppler.mp4

Using a hand held, CONTINUOUS WAVE DOPPLER to demonstrated the difference between an
arterial and venous signal. The arterial signal is characteristically pulsatile. Venous signals are
pick up adjacent to the artery and are lower-pitched, more continuous and phasic and aug-
mentatable with distal compression.

Plain X-ray showing extensive arterial CALCIFICATION in a patient with This video is made in response to a student’s question in a tutorial. Try this yourself.
chronic renal failure. The dorsalis dedis artery (single arrow) and

posterior tibial artery (double arrow) are “visible” on this plain X-ray

Such extensive calcification would lead to a falsely elevated ankle-brachial

index (ABI). Thus, a thorough physical examination of pulses is still
required even with a “normal” ABI. 55