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Published on: November 6, 2017
Association of orthostatic hypotension with incident dementia, stroke, and cognitive decline
Andreea M Rawlings1, Stephen P Juraschek2, Gerardo Heiss2
1From the Department of Epidemiology (A.M.R., S.P.J., E.S., A.R.S., R.F.G.), Johns Hopkins Bloomberg School of Public Health, Baltimore, MD; School of Biological and Population Health Sciences (A.M.R.), Oregon State University, Corvallis; Departments of Medicine (S.P.J.) and Neurology (R.F.G.), Johns Hopkins School of Medicine, Baltimore, MD; Harvard Medical School and Beth Israel Deaconess Medical Center (S.P.J.), Boston MA; Department of Epidemiology (G.H., M.L.M.), University of North Carolina at Chapel Hill; Department of Internal Medicine (T.M.H.), Division of Gerontology and Geriatric Medicine, Wake Forest School of Medicine, Winston-Salem, NC; and Division of Geriatrics (B.G.W.), Department of Medicine, University of Mississippi Medical Center, Jackson. arawlin2@jhu.edu.
Objective:
To examine associations of orthostatic hypotension (OH) with dementia and long-term cognitive decline and to update previously published results in the same cohort for stroke with an additional 16 years of follow-up.
Methods:
We analyzed data from 11,709 participants without a history of coronary heart disease or stroke who attended the baseline examination (1987-1989) of the prospective Atherosclerosis Risk in Communities (ARIC) study. OH was defined as a drop in systolic blood pressure (BP) of at least 20 mm Hg or a drop in diastolic BP of at least 10 mm Hg on standing. Dementia was ascertained via examination, contact with participants or their proxy, or medical record surveillance. Ischemic stroke was ascertained via cohort surveillance of hospitalizations, cohort follow-up, and linkage with registries. Both outcomes were adjudicated. Cognitive function was ascertained via 3 neuropsychological tests administered in 1990 to 1992 and 1996 to 1998 and a full battery of tests in 2011 to 2013. Scores were summarized and reported as SDs. We used adjusted Cox regression and linear mixed models.
Results:
Over ≈25 years, 1,068 participants developed dementia and 842 had an ischemic stroke. Compared to persons without OH at baseline, those with OH had a higher risk of dementia (hazard ratio [HR] 1.54, 95% confidence interval [CI] 1.20-1.97) and ischemic stroke (HR 2.08, 95% CI 1.65-2.62). Persons with OH had greater, although nonsignificant, cognitive decline over 20 years (SD 0.09, 95% CI -0.02 to 0.21).
Conclusions:
OH assessed in midlife was independently associated with incident dementia and ischemic stroke. Additional studies are needed to elucidate potential mechanisms for these associations and possible applications for prevention.
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