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In physiology, perfusion is the process of nutritive delivery of arterial blood to a capillary bed in the biological tissue. The word is derived from the French verb "perfuser" meaning to "pour over or through." Tests of adequate perfusion are a part of patient triage performed by medical or emergency personnel in a mass casualty incident. Perfusion ("F") can be measured with the following formula, where Pa is mean arterial pressure, Pv is mean venous pressure, and R is vascular resistance [1] The term "Pa - Pv" is sometimes presented as "?P", for the change in pressure.[2]
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