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Myocardial rupture is widely accepted as a catastrophic mechanical complication of ST-segment elevation acute myocardial infarction (STEMI).Especially the incidence of myocardial rupture within 48-72h after acute myocardial infarction, defined as early myocardial rupture, has not decreased in spite of the great advancement in the reperfusion treatment with percutaneous coronary intervention (PCI).Beyond recanalizing culprit epicardial coronary arteries, optimal microvascular reperfusion remains a pending issue when treating patients with STEMI with PCI.