title: Education modifies the relation of vascular pathology to cognitive function: cognitive reserve in cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy.
abstract: A clinical impact of cognitive reserve (CR) has been demonstrated in Alzheimer's disease, whereas its role in vascular cognitive impairment (VCI) is largely unknown. In this study, we investigated the impact of CR in patients with cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL), a genetic variant of pure VCI. A total of 247 NOTCH3 mutation carriers from a two-center study were investigated using detailed neuropsychological and neuroimaging protocols. CR was operationalized as years of formal education. Brain pathology was assessed by MRI using normalized brain volume and lacunar lesion volume as proxies. Multivariate analyses were done for each structural measure with scores of processing speed, executive function, and memory as dependent variables. Additional linear regression models were conducted with interaction terms for education × brain volume and education × lacunar lesion volume. Education had an independent impact on cognitive performance in subjects with mild and moderate degrees of brain pathology, whereas there was no significant influence of education on cognition in patients with severe MRI changes. This interaction was found for processing speed, the cognitive domain most impaired in our patients. Our findings demonstrate an interaction of education and brain pathology in regard to cognitive impairment: the effect of education seems most pronounced in early disease stages but may ultimately be overwhelmed by the pathological changes. The results extend the concept of CR to VCI.
authors.affiliation: Institute for Stroke and Dementia Research, Medical Center, Ludwig-Maximilians-University, Marchioninistr. 15, Munich, Germany.
authors.forename: Nikola
authors.initials: N
authors.lastname: Zieren
authors.forename: Marco
authors.initials: M
authors.lastname: Duering
authors.forename: Nils
authors.initials: N
authors.lastname: Peters
authors.forename: Sonia
authors.initials: S
authors.lastname: Reyes
authors.forename: Eric
authors.initials: E
authors.lastname: Jouvent
authors.forename: Dominique
authors.initials: D
authors.lastname: Hervé
authors.forename: Andreas
authors.initials: A
authors.lastname: Gschwendtner
authors.forename: Yvonne
authors.initials: Y
authors.lastname: Mewald
authors.forename: Christian
authors.initials: C
authors.lastname: Opherk
authors.forename: Hugues
authors.initials: H
authors.lastname: Chabriat
authors.forename: Martin
authors.initials: M
authors.lastname: Dichgans
mesh_terms: D000328:Adult; D000368:Aged; D001921:Brain / Q000473:pathology* / Q000503:physiopathology; D046589:CADASIL / Q000473:pathology* / Q000503:physiopathology / Q000523:psychology; D003071:Cognition; D058245:Cognitive Reserve; D004522:Educational Status; D056344:Executive Function; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008568:Memory; D008875:Middle Aged; D009483:Neuropsychological Tests; D011446:Prospective Studies