案例：患者，男性，34岁。1个月前因风湿性主动脉瓣关闭不全行主动脉瓣膜置换术，术后30天出现发热，体温高达40℃。查体：心脏听诊主动脉瓣区可闻及4级舒张期杂音，脾大。患者两次血培养检测到金黄色葡萄球菌，治疗上宜首选

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