Anxiety as a Predictor for Cognitive Decline and Dementia: A Systematic Review and Meta-Analysis

Bernice Gulpers*, Inez Ramakers, Renske Hamel, Sebastian Köhler, Richard C. Oude Voshaar, Frans Verhey

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

124 Citations (Web of Science)

Abstract

Because anxiety is postulated as a risk factor for dementia, we performed a systematic review and meta-analysis to investigate whether anxiety predicts cognitive decline and/or dementia, taking the stage of cognitive decline as well as setting into account. Methods: A systematic literature search up to January 2015 was performed to identify all longitudinal studies on the association between anxiety and cognition. Data extraction and methodological quality assessment were conducted independently by two authors. Where possible, pooled relative risks were calculated to examine anxiety as a possible risk factor for cognitive decline cognitive impairment and dementia in community studies (objective 1), as well as for conversion to dementia patients referred to memory clinics (objective 2). Results: Twenty studies met inclusion criteria. Data on cognitive decline were too heterogeneous for meta-analysis. Anxiety predicted incident cognitive impairment (4 studies, relative risk [RR]: 1.77, 95% confidence interval [CI]: 1.38-2.26, z = 4.50, p <0.001) and dementia (6 studies, RR: 1.57, 95% CI: 1.02-2.42, z = 2.05, p = 0.040) in the community, the latter driven by studies with a mean age of 80 years or above. Among clinical mild cognitive impairment samples, anxiety did not predict conversion to dementia (RR: 1.21, 95% CI: 0.90-1.63, z = 1.28, p = 0.200). Conclusions: Anxiety is associated with an increased risk for cognitive impairment and dementia in the community. Stronger associations were driven by higher age, suggesting that it is a prodromal symptom. Causal biological pathways have also been described, which could explain the risk for incident cognitive impairment in the community. Future studies should include mediating mechanism when studying anxiety as a predictor for cognitive decline and/or dementia.
Original languageEnglish
Pages (from-to)823-842
JournalAmerican Journal of Geriatric Psychiatry
Volume24
Issue number10
DOIs
Publication statusPublished - Oct 2016

Keywords

  • Dementia
  • cognition
  • cognitive decline
  • anxiety
  • risk factor
  • meta-analysis
  • review

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