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因发作性胸痛3天,心前区疼痛2小时入院。测血压85/50mmHg,常规心电图:Ⅱ、Ⅲ、aVF导联ST段抬高0.2～0.3mV,初步诊断:急性下壁心肌梗死。以下叙述正确的是: A. 立即加做18导联心电图,警惕伴右心室梗死 B. 立即抽血查血常规、肌钙蛋白 C. 患者血压偏低,在严密监护下加快补液速度,纠正休克 D. 严密...