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To the editor:Left ventricular (LV) free wall rupture (FWR) is the most fearful complication after acute myocardial infarction (AMI).We present a rare case that the patient underwent successful late reperfusion but suffered catastrophic irreversible collapse during the procedures.rnA 71-year-old ST elevation myocardial infarction (STEMI) man complained of typical chest pain for 24 hours,with a history of hypertension and smoking,no dyslipidemia,or diabetes mellitus.On admission,ECG showed significant mild ST-segment elevation (leads Ⅱ,Ⅲ,aVF,V5-9) and inverted T waves (leads Ⅰ,Ⅱ,Ⅲ,aVL,aVF,V5-9).Medical treatment with aspirin,clopidogrel,atorvastatin and benapril,low molecular weight heparin (LMWH),and no beta blocker because of sinus bradycardia for six days,coronary angiography showed 70％ of middle left anterior descending (LAD),50％ of distal LAD,80％ of the large first diagonal branch;diffuse lesions of large left circumflex coronary artery (LCX),80％-90％of middle LCX with thrombus signs;60％ to 80％ stenoses of right coronary artery (RCA).The LCX was identified as culprit lesion.