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Lorazepam Challenge for Individuals at Varying Genetic Risk for Alzheimer Disease.


ABSTRACT: INTRODUCTION:This study set out to clarify the differential acute cognitive impact of lorazepam based on varying genetic risk for Alzheimer disease. METHODS:Fifty-seven cognitively unimpaired individuals aged 51 to 88, genotyped according to apolipoprotein E (APOE) and translocase of outer mitochondrial membrane (40 homolog) poly-T lengths, completed cognitive testing before, 2.5 and 5 hours after receiving a 1 mg dose of lorazepam. RESULTS:Post-lorazepam, there were significant (P<0.05) declines from baseline in memory, psychomotor processing speed, and executive function. At 2.5 hours, the magnitude of this lorazepam-induced cognitive change was significantly greater in the APOE3/4 group than in the APOE3/3 group for tests of working memory and visuospatial memory/executive function. At 5 hours postchallenge, verbal memory and working memory deficits persisted in the APOE3/4 group compared with the APOE3/3 group. At 5 hours after lorazepam challenge, as compared with the very long/very long group, the short/short group performed slightly worse on a test of working memory (P<0.05), but no other differences were observed among translocase of the outer mitochondrial membrane 40 homolog poly-T variant groups. DISCUSSION:The lorazepam challenge may be unmasking presymptomatic cognitive dysfunction associated with APOE4 carriage.

SUBMITTER: Stonnington CM 

PROVIDER: S-EPMC5699956 | biostudies-literature | 2017 Oct-Dec

REPOSITORIES: biostudies-literature

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Lorazepam Challenge for Individuals at Varying Genetic Risk for Alzheimer Disease.

Stonnington Cynthia M CM   Harel Brian B   Locke Dona E C DEC   Hentz Joseph G JG   Zhang Nan N   Maruff Paul P   Caselli Richard J RJ  

Alzheimer disease and associated disorders 20171001 4


<h4>Introduction</h4>This study set out to clarify the differential acute cognitive impact of lorazepam based on varying genetic risk for Alzheimer disease.<h4>Methods</h4>Fifty-seven cognitively unimpaired individuals aged 51 to 88, genotyped according to apolipoprotein E (APOE) and translocase of outer mitochondrial membrane (40 homolog) poly-T lengths, completed cognitive testing before, 2.5 and 5 hours after receiving a 1 mg dose of lorazepam.<h4>Results</h4>Post-lorazepam, there were signif  ...[more]

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