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Reactive Hyperemia. Reactive hyperemia is the transient increase in organ blood flow that occurs following a brief period of ischemia (e.g., arterial occlusion).hen the occlusion is released, blood flow rapidly increases (i.e., hyperemia occurs) that lasts for several minutes. The hyperemia occurs because during the period of occlusion, tissue hypoxia and a build up of vasodilator metabolites (e.g., adenosine) dilate arterioles and decrease vascular resistance.
With reactive hyperemia, also referred to as passive hyperemia, blood collects in an organ of the body in response to a blockage in the veins that are supposed to move the blood out. This usually takes place after a person experiences a period of ischemia, such as arterial occlusion.yperemia is a condition in which blood congests in a particular area of the body. It can be either active or reactive. Active hyperemia takes place during muscle contraction, which has earned it additional names, such a functional hyperemia and exercise hyperemia.