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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.
reactive depression a usually transient depression that is precipitated by a stressful life event or other environmental factor, in contrast to an endogenous depression. retarded depression major depressive disorder characterized by signs and symptoms of psychomotor retardation, such as burdened movements and slowed, toneless speech. situational depression reactive depression. unipolar depression a type that is not accompanied by episodes of mania or hypomania, such as major depressive disorder or dysthymic disorder.