The association between orthostatic hypotension and dementia: A meta-analysis of prospective cohort studies.

Abstract

As for the association between orthostatic hypotension (OH) and dementia, results of published studies are inconsistent; therefore, current substantive conclusions have yet been obtained. This meta-analysis was conducted in hopes of producing progress in this topic. A systematic database search was performed towards electronic databases including Chinese Biomedical Database, PubMed, Web of Science, Wiley Online Library, ScienceDirect, and the Cochrane Library. Five prospective cohort studies were included. Summary hazard ratio (HR) estimates with 95% confidence intervals (CIs) were calculated by random-effects model. Statistical heterogeneity was assessed with the Cochran Q test and I2 statistic. A sensitivity analysis was also conducted in this meta-analysis. A 22.4% higher prevalence of dementia in subjects with OH was obtained (adjusted pooled HR was 1.224; 95% CI: 1.106-1.354; P<.001). This meta-analysis also showed significant associations between OH and 2 dementia subtypes: Alzheimer disease (adjusted pooled HR was 1.175; 95% CI: 1.022-1.351; P=.023) and Vascular dementia (adjusted pooled HR was 1.403; 95% CI: 1.042-1.889; P=.026), respectively. Orthostatic hypotension is positively associated with the overall prevalence of dementia, and it may contribute to the prevalence of Alzheimer disease and Vascular dementia as well.