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Neuropsychological assessment more efficient than MRI for tracking disease progression
Date:2/18/2014

entia.

At baseline and after two years, neurologists examined the study participants and judged whether or not their cognition was normal. After two years of follow-up, twenty-eight patients were considered to be normal, and 34 had mild cognitive impairment or had progressed to dementia, mostly Alzheimer's disease. At baseline and at follow-up all patients had a state-of-the-art MRI scan, and memory and other cognitive functions were tested with five standard neuropsychological tests.

In the group that the neurologists considered normal at follow-up, cognitive performance was indeed normal at baseline, and it remained so after two years. In the group that was considered impaired, however, cognition was already abnormal at baseline and it declined considerably over the next two years. The MRI measures concerned volumes of the left and right hippocampus, which are extremely important for memory functioning, and are the first to degenerate during the Alzheimer disease process. The volume of the hippocampus decreased less than 1% in the normal group during the follow-up interval, and more than 3% in the impaired group. The pattern of findings was similar for both techniques, but MRI showed less pronounced differences between both groups at baseline than the cognitive tests, and more importantly, less pronounced differences in rate of change.

Using figures on rates of change as collected in this study, one may calculate the numbers of patients that would be needed for a hypothetical clinical trial of a new drug. The investigators concluded that only half as many patients would be needed if neuropsychological assessment were used as the gold standard rather than MRI measures of brain atrophy. However, Dr, Edo Richard, one of the neurologists conducting the study, says, "Whichever outcome is selected, evaluation of functioning as it can be noticed by patients will always be needed to confirm the clinical relevance of any treatment effect." '/>"/>

Contact: Daphne Watrin
d.watrin@iospress.nl
31-206-883-355
IOS Press
Source:Eurekalert

Page: 1 2 3

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