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患者，女性，50岁。家属急诊送入院，主诉上腹痛3天，今晨便血1次约300ml，伴晕倒。既往冠心病病史4年。检查：血压95/65mmHg，脉搏95次/分，神志清，心肝脾检查无异常，肠鸣音活跃。患者出血停止后，为明确病因，应首选的检查是A、粪便检查 B、内镜检查 C、血常规检查 D、X线钡餐造影检查 E、选择性动脉造影 抢救时禁用A、法莫替丁 B、生长 C、兰索拉唑 D、去甲肾上腺素 E、垂体后
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