题目内容

男，56岁的心房纤颤患者，突然发生命名困难。二周来共发生过5次，每次持续2～15秒。查体无神经系统异常。脑 CT无异常主要累及的血管是

A. 基底动脉系
B. 椎动脉系
C. 颈内动脉系
D. 大脑后动脉
E. 大脑前动脉

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