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an excess of blood in a part; called also engorgement. adj., adj hypere´mic.
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.
hyperemia resulting from an increased afflux of arterial blood into dilated capillaries.
Etymology: L, activus + Gk, hyper, excessive, haima, blood
the increased flow of blood into a particular body part, caused by an increase in vasoactive metabolites. It is associated with increased metabolism.