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Definition: This measurement is the ratio of the pulsatile blood flow (often graphically displayed by a plethysmograph) to the nonpulsatile blood flow in a patient's peripheral tissue, usually the patient's finger. This index correlates with capillary refill time and thus is an indicator of tissue blood perfusion.

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.