患者，男，55岁。表情呆滞，行动迟缓，口齿不清，记忆力、空间定向能力、计算能力明显下降，腰膝酸软，食少纳呆，少气懒言，流涎，舌淡胖，苔白，脉沉弱。头颅CT显示脑白质内多发低密度灶。既往有脑梗死病史。该患者的中医辨证是

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