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May 19, 2009; 72 (20) Articles

Duration of antihypertensive drug use and risk of dementia

A prospective cohort study

M.D.M. Haag, A. Hofman, P. J. Koudstaal, M. M.B. Breteler, B. H.C. Stricker
First published February 18, 2009, DOI: https://doi.org/10.1212/01.wnl.0000345062.86148.3f
M.D.M. Haag
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A. Hofman
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P. J. Koudstaal
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M. M.B. Breteler
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B. H.C. Stricker
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Citation
Duration of antihypertensive drug use and risk of dementia
A prospective cohort study
M.D.M. Haag, A. Hofman, P. J. Koudstaal, M. M.B. Breteler, B. H.C. Stricker
Neurology May 2009, 72 (20) 1727-1734; DOI: 10.1212/01.wnl.0000345062.86148.3f

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Abstract

Background: The evidence from prospective observational research for a protective effect of antihypertensive drug use on the risk of dementia is far from uniform. Duration of follow-up was limited and relied mainly on baseline drug exposure data without information on duration of use. We investigated the association between the duration of antihypertensive use and risk of dementia.

Methods: We followed 6,249 participants (mean 68.4 years, 60% women) of a prospective, population-based cohort from baseline (1990–1993) until 2005 for incident dementia. Continuous data on filled prescriptions came from pharmacy records. Total cumulative duration of antihypertensive use was expressed in years. We subtracted a latent 4-year period before the date of dementia diagnosis in the quantification of exposure duration to avoid potential bias in antihypertensive prescription due to prodromal changes in blood pressure or cognition. With Cox regression models, we calculated crude and adjusted hazard ratios (HRs) of all dementia and Alzheimer disease (AD) with antihypertensive use vs never used.

Results: Compared to never used, antihypertensive use was associated with a reduced risk of all dementia (adjusted HR per year of use 0.95; 95% confidence interval [CI] 0.91–0.99). We observed an 8% (95% CI −15% to −1%) risk reduction per year of use for persons ≤75 years, whereas for persons >75 years this was 4% (95% CI −11% to 4%). Equivalent estimates were observed for AD. No apparent differences were observed among different types of antihypertensive drugs.

Conclusions: Antihypertensive drug use was associated with 8% risk reduction of dementia per year of use for persons ≤75 years.

Glossary

ACE=
angiotensin-converting enzyme;
AD=
Alzheimer disease;
AT2=
angiotensin-2;
ATC=
Anatomic Therapeutic Chemical;
BMI=
body mass index;
BP=
blood pressure;
CCB=
calcium channel blocker;
CHD=
coronary heart disease;
CI=
confidence interval;
DBP=
diastolic blood pressure;
DHP=
dihydropyridine;
DM=
diabetes mellitus;
DSM=
Diagnostic and Statistical Manual of Mental Disorders;
GMS=
Geriatric Mental State schedule;
HR=
hazard ratio;
MI=
myocardial infarction;
MMSE=
Mini-Mental State Examination;
NINCDS-ADRDA=
National Institute of Neurological and Communicative Disorders and Stroke–Alzheimer's Disease and Related Disorders Association;
NINDS-AIREN=
National Institute of Neurological Disorders and Stroke–Association Internationale pour la Recherche en l'Enseignement en Neurosciences;
OR=
odds ratio;
RR=
relative risk;
SBP=
systolic blood pressure.
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