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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.
active hyperemia (arterial hyperemia) that due to local or general relaxation of arterioles. leptomeningeal hyperemia congestion of the pia-arachnoid. passive hyperemia that due to obstruction of flow of blood from the area. reactive hyperemia that due to increase in blood flow after its temporary interruption.venous hyperemia passive hyperemia.eptomeningeal hyperemia congestion of the pia-arachnoid. passive hyperemia that due to obstruction of flow of blood from the area. reactive hyperemia that due to increase in blood flow after its temporary interruption. venous hyperemia passive hyperemia.