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当前学科：心血管内科综合练习
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男性，83岁，七年前因前壁心肌梗死行冠脉造影，提示三支病变，于前降支及右冠置入支架各一个。既往有高血压病、糖尿病病史。近1个月来，反复心前区疼痛，多于夜间发生，持续约半小时左右症状改善。此次为进一步诊疗收入院。结合病史，该患者最可能的诊断为（）.
A . A.返流性食道炎
B . 不稳定型心绞痛
C . 变异型心绞痛
D . 急性胸膜炎
E . 肋软骨炎
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