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Figure 6 Blood volume of ischemically injured myocardium at various durations of reperfusion. Values are expressed as percentage of the blood volume of normal myocardium. The elevated blood volume at onset of reperfusion likely represents postischemic hyperemia; the decreased blood volume after 24 h of reperfusion may be the consequence of edema and external compression of the microvasculature, microvascular plugging and swelling of endothelial cells.