hyperemia [hi″per-e´me-ah]
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.