A comparison of cognitive functioning in older adults with and without traumatic brain injury.
OBJECTIVE
Cognitive impairments are common sequelae of traumatic brain injury (TBI) and are often associated with the natural process of aging. Few studies have examined the effect of both age and TBI on cognitive functioning. The purpose of this study was to compare cognitive functioning between older adults who sustained a TBI to an age-matched group of individuals without a brain injury and to determine whether the presence or absence of a genetic marker apolipoprotein epsilon (APOEepsilon4 allele) accounts for additional cognitive decline in both groups examined.


METHODS
Cognitive performance was measured by 11 neuropsychological tests, in 54 adults with TBI aged 55 and older and 40 age-matched control participants. All participants were reexamined 2 to 5 years later.


METHODS
Community volunteer-based sample examined at a large, urban medical center.


METHODS
California Verbal Learning Test; Wechsler Memory Scale-III (Logical Memory I & II; Visual Reproduction I & II); Grooved Pegboard; Woodcock-Johnson Test of Cognitive Ability (Visual Matching and Cross-out); Wisconsin Card Sorting Test; Trail Making Test A & B; Conners' Continuous Performance Task; Wechsler Adult Intelligence Scale-III (Vocabulary); Controlled Oral Word Association Test; and Boston Naming Test.


RESULTS
Participants with TBI had lower scores on tests of attention and verbal memory than did participants with no disability. Neither group exhibited a significant decline in cognitive function over time. The presence of the APOEepsilon4 allele did not account for additional decline in cognitive function in either group.


CONCLUSIONS
The findings suggest that older adults with TBI may not be at increased risk for cognitive decline over short time periods (2 to 5 years) even if they are carriers of the APOEepsilon4 allele.
Department of Rehabilitation Medicine, Mount Sinai School of Medicine, New York, NY 10029, USA. teresa.ashman@mssm.edu
Teresa A
TA
Ashman
Joshua B
JB
Cantor
Wayne A
WA
Gordon
Amanda
A
Sacks
Lisa
L
Spielman
Matthew
M
Egan
Mary R
MR
Hibbard
D000368:Aged; D000369:Aged, 80 and over; D000483:Alleles; D053327:Apolipoprotein E4 / Q000235:genetics; D001288:Attention / Q000502:physiology; D001930:Brain Injuries / Q000235:genetics / Q000503:physiopathology*; D016022:Case-Control Studies; D003071:Cognition / Q000502:physiology*; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D011939:Mental Recall / Q000502:physiology; D008875:Middle Aged; D009483:Neuropsychological Tests; D014705:Verbal Behavior / Q000502:physiology
D053327:Apolipoprotein E4