When blood flows to the limb pushed by the heart muscle contraction, the size of the limb changes proportionately to the amount of blood rushing in.
Using inflated cuffs that encircle the limb permits the elctronic circuitry to detect even the minute changes in the volume of the limb. These changes are the graphed electronically. The resultant graph corresponds to the flow pattern in the arteries of the limb and an obstruction in any of the arteries shows a change in the graph that could be interpreted by the vascular surgeon.
The graph on the right hand side is an example of normal and of disturbed arterial blood flow in a limb.
Pulse Volume Recording PVR
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