High concentrations of certain substances in the blood makes it possible to predict the occurrence of dementia in older people, scientists say. The study included 1,125 persons aged 70 years and older. Experts analyzed the participants blood. Observation was 4.5 years, during which time the Alzheimer's disease (dementia) was diagnosed in 104 persons. Of blood tests, researchers found that the highest risk of Alzheimer's disease in patients with high blood levels of clog A-beta 42, the main component of the plaques, the blood vessels and impede blood flow to the brain was observed. According to researchers at Columbia University (USA), participants with elevated levels of A-beta 42 in the first study, the risk of dementia was 4.5 years higher than three times than that of the participants with low this substance. Before the study, some patients were already early signs of Alzheimer's disease. The content of the substance of these participants had increased dramatically. Based thereon, the researchers concluded that this diagnostic method may be applied in the future to the initial stages of Alzheimer's disease, to determine with high accuracy.
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