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患者，男性，50岁。突发胸痛2h急诊。初步诊断为主动脉夹层。平时血压正常，而此时血压高达29．3／14．7kPa（220／110mmHg），降压药物的治疗效果不佳，其原因可能为（）
A . 疼痛引起的应激
B . 主动脉夹层本身引起
C . 急性肾梗
D . 动脉外膜破裂
E . 休克
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