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女性，45岁，因关节疼痛长期服用吲哚美辛，黑便2次，呕血1次，来院急诊，疑诊急性胃炎，除嘱停用该药物外，应首先采取什么措施（）
A . 阿托品缓解腹痛
B . 止血补充血容量
C . 硫糖铝保护胃黏膜
D . 抑酸剂降低胃内ph
E . 急诊胃镜检查
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