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I think it is decreased blood supply to organs and tissues. I also think it is the stopped circulation. However, both ones cannot be right, I think.

What is ischaemia exactly?

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Is insufficient blood supply a better word? – scaaahu Mar 10 '14 at 6:07
I am asking this because we have too venous congestion which is decreased blood supply to tissue. So Ischemia and Venous congestion should be orthogonal terms. – Masi Mar 10 '14 at 7:08
As I understand it, venous congestion is one of several possible causes for ischeamia. So a venous congestion would lead to ischeamia, but ischeamia does not imply venous congestion. – jarlemag Mar 10 '14 at 11:18
up vote 4 down vote accepted

Ischaemia is lack of sufficient perfusion to a tissue. Reduced perfusion could therefore mean decreased blood supply to organs and tissues and could also mean a complete cessation of blood flow to an area - therefore both can be correct as they are on a continuum. Infarction is tissue death due to hypoxia which can result from ischaemia that is not swiftly resolved.

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