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目的研究冻干重组人脑钠肽(recombinant human brain natriuretic pepfide,rhBNP)对急性心肌梗死患者急诊经皮冠状动脉介入(percutaneous coronary intervention,PCI)治疗后心肌梗死溶栓试验(thrombolysis in myocardial infarction.TIMI)血流、脑钠肽(brain natriuretic peptide,BNP)、左心室射血分数(left ventricular ejection fracti