The researchers found that abnormal levels of biomarkers identified in PET scans and lumbar punctures could predict who would develop cognitive impairment among the volunteers who were followed for an average of 3.7 years, but in some cases as long as 7.5 years. Some 28 volunteers (14 percent) of the group developed memory loss and other signs of cognitive impairment. Abnormal levels of all biomarkers predicted the development of Alzheimer’s dementia equally well, the study found. Older participants, men, and African Americans who developed dementia did so faster than those who were younger, female, and white, the researchers report. In a few cases, participants with abnormal biomarker levels remained cognitively normal, perhaps because of “cognitive reserve,” the ability of some brains to cope with or stave off decline.
Reference: Roe CM, et al. Amyloid imaging and CSF biomarkers in predicting cognitive impairment up to 7.5 years later.
Reference: Roe CM, et al. Amyloid imaging and CSF biomarkers in predicting cognitive impairment up to 7.5 years later. Neurology 2013;80(19):1784-91.