Background: Poststroke depression is common, affecting approximately 1 in 3 stroke survivors. We aimed to evaluate the association between depression and mortality in adults with and without prior stroke.
Methods: Using the National Health and Nutrition Examination Survey (NHANES) I Epidemiologic Follow-up Study (1982-1992), we investigated the association between depression and all-cause mortality among adults aged 25-74 years with and without prior stroke, and stroke mortality among stroke survivors, adjusting for covariates.
Results: Among 9919 individuals, 121 (1.2%) reported prior stroke. The adjusted depression prevalence was 37.1% among stroke survivors and 17.3% among individuals without stroke. In persons aged 25-64 years, neither stroke nor depression was associated with all-cause mortality. The combination of depression and stroke was not associated with all-cause mortality (adjusted hazard ratio [HR] 2.83, 95% confidence interval [CI] .67-12.04). Among persons aged 65-74 years, depression alone (adjusted HR 1.24, 95% CI 1.04-1.47), stroke alone (adjusted HR 1.64, 95% CI 1.17-2.32), and the combination of depression and stroke (adjusted HR 2.28, 95% CI 1.79-2.90) were associated with all-cause mortality, consistent with an additive relationship. Among all ages, the combination of depression and stroke was associated with all-cause mortality (adjusted HR 1.93, 95% CI 1.28-2.92). Higher stroke mortality was only observed in those aged 65-74 years (adjusted HR 2.43, 95% CI 1.05-5.60). Compared with stroke survivors without depression, those with depression were ~35 times more likely to die from a stroke (adjusted HR 35.33, 95% CI 7.79-160.32).
Conclusions: The combination of prior stroke and depression is associated with higher all-cause mortality than either condition alone. The presence of depression after stroke increases stroke mortality 35-fold, highlighting the importance of identifying and treating depression among stroke survivors.
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