老年性痴呆是一种由于大脑器质性损害而引起的脑功能障碍,使认知、记忆、理解、自我控制等能力逐渐发生退化的病症。65岁以上人群中老年痴呆的患病率为5%~15%,80岁以上患病率则达30%以上,我国每年平均有30万新发 Alzheimer’s disease is a condition in which brain dysfunction caused by organic brain damage gradually degenerates the ability of cognition, memory, understanding and self-control. The prevalence of dementia in people over 65 years old is 5% ~ 15%, and the prevalence rate of over 80 years old is over 30%. In China, there are an average of 300,000 new hair