Hypoperfusion vs. Ischemia — What's the Difference?

Decreased perfusion, especially of blood through an organ

Ischemia or ischaemia is a restriction in blood supply to tissues, causing a shortage of oxygen that is needed for cellular metabolism (to keep tissue alive). Ischemia is generally caused by problems with blood vessels, with resultant damage to or dysfunction of tissue i.e.

A decrease in the blood supply to a bodily organ, tissue, or part caused by constriction or obstruction of the blood vessels.

Local disturbance in blood circulation due to mechanical obstruction of the blood supply (for example, embolism, thrombosis, or vasoconstriction).

Local anemia in a given body part sometimes resulting from vasoconstriction or thrombosis or embolism