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Resistance Index
What is the resistance index, and how may it be useful in managing renal artery stenosis?
The resistance index is a measure of relative blood flow velocity during systole and diastole within the renal arterial supply using Doppler ultrasonography. It is calculated with the following formula:
How Resistance Index useful in managing renal artery stenosis
It has been shown to correlate with changes in blood pressure following revascularization.
Specifically, a high resistance index of >80 suggests extensive atherosclerotic disease of the smaller vessels in the arterial network and is associated with a lack of improvement in blood pressure following revascularization.
