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[Comment] Circadian rhythm and ischaemia–reperfusion injury

Every day, thousands of patients are exposed to ischaemia-reperfusion injury, either in uncontrolled circumstances (eg, acute myocardial infarction or ischaemic stroke) or under controlled conditions (eg, heart, kidney, or liver surgery, or transplantation). Whatever the clinical setting is, the extent of final tissue damage (ie, infarct size) is mainly determined by the duration of the ischaemic phase and the amount of jeopardised tissue.1 Experimental and proof-of-concept clinical trials have shown that infarct size results from the addition of an ischaemia-induced injury plus a reperfusion-induced injury, and that timely interventions might attenuate the latter.