男,56岁,心房颤动患者,突然发生命名物名困难。2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 campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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