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The arterial resistivity index (RI), developed by Leandre Pourcelot, is a measure of pulsatile blood flow that reflects the resistance to blood flow caused by microvascular bed distal to the site of measurement. A resistive index of 0 corresponds to continuous flow; a resistive index of 1 corresponds to systolic but no diastolic flow; and a resistive index greater than 1 corresponds to reversed diastolic flow. Formula = (Peak systolic velocity - End diastolic velocity) / Peak systolic velocity.[1] The RI is altered not by vascular resistance alone but by the combination of vascular resistance and vascular compliance[2][3] External links Other Notes
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