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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.
Primary hyperoxaluria type 1: A rare inherited inborn metabolic disorder characterized by excessive amounts of oxalate in the urine and deposits of oxalate in the kidneys which leads to progressive kidney failure. There are two subtypes of Oxalosis, each with a different origin for the genetic defect involved.rimary hyperoxaluria type 1 is listed as a  rare disease  by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Primary hyperoxaluria type 1, or a subtype of Primary hyperoxaluria type 1, affects less than 200,000 people in the US population.