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Ann Thorac Surg 2001;71:823-826
© 2001 The Society of Thoracic Surgeons


Original article: cardiovascular

The role of apolipoprotein E in cognitive decline after cardiac operation

Liz Steed, MSca, Robert Kong, FRCAa, Jan Stygall, MSca, Jayshree Acharya, PhDb, Manjeet Bolla, MScb, Michael J.G. Harrison, FRCPc, Steve E. Humphries, PhDb, Stanton P. Newman, DPhila

a Unit of Health Psychology, Department of Psychiatry and Behavioural Sciences, London, England, United Kingdom
b Centre for Cardiovascular Genetics, Department of Medicine, London, England, United Kingdom
c Neurological Studies, University College London, London, England, United Kingdom

Accepted for publication October 18, 2000.

Address reprint requests to Prof Newman, Unit of Health Psychology, Department of Psychiatry, RF & UCL Medical School, Wolfson Bld, 48 Riding House St, London, W1N 8AA, England
e-mail: s.newman{at}ucl.ac.uk

Background. Recently, Tardiff and colleagues have suggested that the presence of the apolipoprotein E, {epsilon}4 allele was associated with increased likelihood of cognitive decline after coronary artery bypass grafting. The objective of the current study was to replicate this earlier work using an increased sample size. The increased sample also enabled an analysis by individual genotype in cognitive decline after coronary artery bypass grafting.

Methods. Apolipoprotein E genotyping was performed on 111 individuals undergoing coronary artery bypass grafting. Each participant underwent a battery of nine neuropsychological tests before operation and 4 to 7 weeks after operation.

Results. Cognitive decline, assessed by both continuous Z change scores and two categoric measures of cognitive deficit, was not significantly associated with either individual apolipoprotein E genotypes or categorization by the presence or absence of the {epsilon}4 allele. The examination of potential moderating factors did not alter this finding.

Conclusions. This study suggests that the {epsilon}4 allele is not associated with cognitive decline in the weeks after coronary artery bypass grafting.




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