During the course of the research , one drug in particular was identified as effectie in blocking the accumulation of beta - amyloid in the brain and preenting the deterioration of cognitie performance 在研究的过程中,特别筛选出一个能有效阻止脑内-淀粉样蛋白蓄积并且预防认知能力减退的药物,即盐酸普萘洛尔(心得安) 。