Associations between magnetic resonance imaging measures and neuropsychological impairment in early and late onset alzheimer's disease.
OBJECTIVE
To assess the associations of global atrophy and white matter hyperintensities (WMH) with neuropsychological function in early and late onset Alzheimer's disease (AD).


METHODS
We included 107 patients with sporadic AD (21 early onset and 86 late onset) from our memory clinic. Tests for (working) memory, language, executive function, mental speed, and attention were administered. Global atrophy and global and lobar WMH were measured using 1 Tesla MRI. Linear regression analyses with terms for MRI measures, neuropsychological test results, age, gender, education, and the interaction between separate brain measures and age of onset were performed.


RESULTS
Global atrophy was associated with more severely impaired global cognition, working memory, mental speed, and executive function (p < 0.05). Significant interactions between global atrophy and age at onset showed that these associations were mostly attributable to patients with early onset AD. By contrast, an association between global atrophy and memory was found, which was specifically attributable to late onset AD patients. No associations between global WMH and cognitive function were found. Subsequently we analyzed regional WMH and found that temporal WMH was associated with impaired memory, and frontal WMH was associated with slower mental speed.


CONCLUSIONS
Cortical atrophy, a key feature of AD, is linked to a wide range of cognitive functions, specifically in early onset AD patients. For WMH, there were no interactions with age at onset, but we found specific associations between temporal WMH and memory and frontal WMH and mental speed.
Alzheimer Center & Department of Neurology, Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands. ae.vdvlies@vumc.nl
Annelies E
AE
van der Vlies
Salka S
SS
Staekenborg
Faiza
F
Admiraal-Behloul
Niels D
ND
Prins
Frederik
F
Barkhof
Hugo
H
Vrenken
Johan H C
JH
Reiber
Philip
P
Scheltens
Wiesje M
WM
van der Flier
D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000175:diagnosis* / Q000378:metabolism / Q000523:psychology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests