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As the most dramatic and fatal complication, left ventricular free-wall rupture (LVFWR) used to present in approximately 3% of patients with acute myocardial infarction. After the introduction of primary percutaneous coronary intervention, the incidence of LVFWR decreased but remained approximately 1.7% . Left ventricular free-wall rupture occurs in patients with transmural myocardial infarction, which is almost exclusively ST-elevation myocardial infarction (STEMI) . This condition carries a high mortality as a result of hemopericardium and cardiac tamponade. Left ventricular free-wall rupture rarely occurs in patients with non-ST-elevation myocardial infarction, but the risk of it cannot be ignored. This case describes early development LVFWR after non-ST-elevation myocardial infarction to evoke high vigilance of clinicians to this condition.