Alzheimer's Pathology Related To Episodic Memory In Those Without Dementia.
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Alzheimer's pathology can appear in the brains of older men and women without dementia or mild cognitive impairment. The pathology is related to loss of episodic memory, according to a new study published in the June 27, 2006, issue of Neurology, the scientific journal of the American Academy of Neurology.
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The study evaluated 134 older men and women who didn't have cognitive impairment at the time of their death. Participants came from the Religious Orders Study and the Memory and Aging Project. Both are longitudinal, clinical-pathologic studies of older persons without dementia who underwent annual clinical evaluations and several cognitive performance tests. After they died, their brains were examined at autopsy for evidence of pathology.
More than a third of the participants (50) met criteria for a pathologic diagnosis of Alzheimer's disease. Criteria included lesions of brain tissue on the autopsy. This group also scored significantly lower than the other participants on tests for episodic memory, such as recalling stories and word lists.
"The results provide evidence in support of the idea that some type of neural reserve can allow a large number of older persons to tolerate a significant amount of Alzheimer's pathology without manifesting obvious dementia," said study author David A. Bennett, MD, of the Rush Alzheimer's Disease Center in Chicago.
Scores on the Mini Mental State Examination, a mental status screening test of cognitive functions, were nearly identical for participants with and without a pathologic diagnosis of Alzheimer's disease.
"This study questions the acceptability of minor episodic memory loss in older adults as 'normal'," said Carol F. Lippa, MD, who wrote an editorial in the same issue of Neurology. "Maybe this early decline in episodic memory precedes mild cognitive impairment and should be the target of research efforts in the early detection of Alzheimer's disease."
Older people at higher risk of dementia do not benefit from a combination of vitamin B and folate, say researchers from the University of Otabo, Dunedin, New Zealand. Even after two years of taking the vitamins daily, volunteers did not better in cognitive tests than those who were given a placebo. Click link to read more.
http://www.medicalnewstoday.com/healthnews.php?newsid=46226&nfid=al
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The study evaluated 134 older men and women who didn't have cognitive impairment at the time of their death. Participants came from the Religious Orders Study and the Memory and Aging Project. Both are longitudinal, clinical-pathologic studies of older persons without dementia who underwent annual clinical evaluations and several cognitive performance tests. After they died, their brains were examined at autopsy for evidence of pathology.
More than a third of the participants (50) met criteria for a pathologic diagnosis of Alzheimer's disease. Criteria included lesions of brain tissue on the autopsy. This group also scored significantly lower than the other participants on tests for episodic memory, such as recalling stories and word lists.
"The results provide evidence in support of the idea that some type of neural reserve can allow a large number of older persons to tolerate a significant amount of Alzheimer's pathology without manifesting obvious dementia," said study author David A. Bennett, MD, of the Rush Alzheimer's Disease Center in Chicago.
Scores on the Mini Mental State Examination, a mental status screening test of cognitive functions, were nearly identical for participants with and without a pathologic diagnosis of Alzheimer's disease.
"This study questions the acceptability of minor episodic memory loss in older adults as 'normal'," said Carol F. Lippa, MD, who wrote an editorial in the same issue of Neurology. "Maybe this early decline in episodic memory precedes mild cognitive impairment and should be the target of research efforts in the early detection of Alzheimer's disease."
Older people at higher risk of dementia do not benefit from a combination of vitamin B and folate, say researchers from the University of Otabo, Dunedin, New Zealand. Even after two years of taking the vitamins daily, volunteers did not better in cognitive tests than those who were given a placebo. Click link to read more.
http://www.medicalnewstoday.com/healthnews.php?newsid=46226&nfid=al
posted by Valery Yermalitsky at
6:38 AM
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