Cognitive and behavioral correlates of low vitamin B12 levels in elderly patients with progressive dementia.
Vitamin B12 deficiency is common in elderly persons, yet its role in dementia and psychiatric illness is unclear. The authors examined the relationship between vitamin B12 serum levels and cognitive and neuropsychiatric symptoms in dementia. Community-dwelling elderly subjects (N=643) meeting NINCDS-ADRDA criteria for probable or possible Alzheimer disease (AD) underwent comprehensive neuropsychiatric evaluation and measurement of vitamin B12 serum levels. Thirty-seven subjects (5.7%) had low B12 serum levels (200 pcg/ml or less). Subjects with low B12 levels were significantly older and had significantly lower scores on the Mini-Mental State Exam and higher scores on the Blessed Dementia Scale, but not a different pattern of cognitive or behavior disturbances compared with the normal-B12 subjects. In AD, the prevalence of low vitamin B12 serum levels is consistent with that found in community-dwelling elderly persons in general but is associated with greater overall cognitive impairment.
Whyte
Ellen M
EM
Department of Psychiatry, University of Pittsburgh, Pittsburgh, Pennsylvania, USA. whyteem@msx.upmc.edu.
Mulsant
Benoit H
BH
Butters
Meryl A
MA
Qayyum
Moshin
M
Towers
Adele
A
Sweet
Robert A
RA
Klunk
William
W
Wisniewski
Steve
S
DeKosky
Steven T
ST
D000368:Aged; D000544:Alzheimer Disease / Q000097:blood* / Q000523:psychology*; D003072:Cognition Disorders / Q000097:blood* / Q000523:psychology*; D005260:Female; D006801:Humans; D008297:Male; D001523:Mental Disorders / Q000097:blood* / Q000523:psychology*; D011569:Psychiatric Status Rating Scales; D014806:Vitamin B 12 Deficiency / Q000097:blood* / Q000523:psychology*