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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.
Uremia is a clinical state in which the blood urea nitrogen level, an indicator of nitrogen waste products, is elevated.In uremia, the kidneysâ failure to filter nitrogen waste properly leads to excessively high levels of nitrogen wastes in the bloodstream.Uremia is life-threatening because too much nitrogen in the blood is toxic to the body.Symptoms of uremia include confusion, loss of consciousness, low urine production, dry mouth, fatigue, weakness, pale skin or pallor, bleeding problems, rapid heart rate (tachycardia), edema (swelling), and excessive thirst.n uremia, the kidneysâ failure to filter nitrogen waste properly leads to excessively high levels of nitrogen wastes in the bloodstream. Uremia is life-threatening because too much nitrogen in the blood is toxic to the body.