癡呆癥·阿爾茲海默癥與維生素B6,B12,葉酸的關聯性

癡呆癥·的危險因子因研究已經變得明確。研究概括的詳情請在這裏查看

Plasma Homocysteine as a Risk Factor for Dementia and Alzheimer’s Disease

METHODS

A total of 1092 subjects without dementia (667 women and 425 men; mean age, 76 years) from the Framingham Study constituted our study sample. We examined the relation of the plasma total homocysteine level measured at base line and that measured eight years earlier to the risk of newly diagnosed dementia on follow-up. We used multivariable proportional-hazards regression to adjust for age, sex, apolipoprotein E genotype, vascular risk factors other than homocysteine, and plasma levels of folate and vitamins B12 and B6.

RESULTS

Over a median follow-up period of eight years, dementia developed in 111 subjects, including 83 given a diagnosis of Alzheimer’s disease. The multivariable-adjusted relative risk of dementia was 1.4 (95 percent confidence interval, 1.1 to 1.9) for each increase of 1 SD in the log-transformed homocysteine value either at base line or eight years earlier. The relative risk of Alzheimer’s disease was 1.8 (95 percent confidence interval, 1.3 to 2.5) per increase of 1 SD at base line and 1.6 (95 percent confidence interval, 1.2 to 2.1) per increase of 1 SD eight years before base line. With a plasma homocysteine level greater than 14 μmol per liter, the risk of Alzheimer’s disease nearly doubled.

CONCLUSIONS

An increased plasma homocysteine level is a strong, independent risk factor for the development of dementia and Alzheimer’s disease.