题目内容
女性，76岁，因反复晕厥伴抽搐半天入院，既往高血压病史20年。体检：血压200/55mmHg，心率45/min，律齐，心尖部第一心音强弱不等，心底部2/6级收缩期杂音。此患者反复晕厥、抽搐的原因可能是（）
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