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The impact of atrial fibrillation and long-term oral anticoagulant use on all-cause and cardiovascular mortality: A 12-year evaluation of the prospective Brazilian Study of Stroke Mortality and Morbidity.

Authors
  • Goulart, Alessandra C1, 2
  • Olmos, Rodrigo Diaz1, 2
  • Santos, Itamar S1, 2
  • Tunes, Gisela3
  • Alencar, Airlane P3
  • Thomas, Neil4
  • Lip, Gregory Yh5, 6
  • Lotufo, Paulo A1, 2
  • Benseñor, Isabela M1, 2
  • 1 Center for Clinical and Epidemiological Research, Hospital Universitário, Universidade de São Paulo, São Paulo, Brazil. , (Brazil)
  • 2 School of Medicine, Universidade de São Paulo, São Paulo, Brazil. , (Brazil)
  • 3 Institute of Mathematics and Statistics, Universidade de São Paulo, São Paulo, Brazil. , (Brazil)
  • 4 Institute for Applied Health Research, University of Birmingham, Birmingham, UK.
  • 5 Liverpool Centre for Cardiovascular Science, University of Liverpool and Liverpool Heart & Chest Hospital, Liverpool, UK.
  • 6 Aalborg Thrombosis Research Unit, Department of Clinical Medicine, Aalborg University, Aalborg, Denmark. , (Denmark)
Type
Published Article
Journal
International Journal of Stroke
Publisher
SAGE Publications
Publication Date
Jan 01, 2022
Volume
17
Issue
1
Pages
48–58
Identifiers
DOI: 10.1177/1747493021995592
PMID: 33527882
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Atrial fibrillation is a predictor of poor prognosis after stroke. To evaluate atrial fibrillation and all-cause and cardiovascular mortality in a stroke cohort with low socioeconomic status, taking into consideration oral anticoagulant use during 12-year follow-up. All-cause mortality was analyzed by Kaplan-Meier survival curve and Cox regression models to estimate hazard ratios and 95% confidence intervals (95% CI). For specific mortality causes, cumulative incidence functions were computed. A logit link function was used to calculate odds ratios (OR) with 95% CIs. Full models were adjusted by age, sex, oral anticoagulant use (as a time-dependent variable) and cardiovascular risk factors. Of 1121 ischemic stroke participants, 17.8% had atrial fibrillation. Overall, 654 deaths (58.3%) were observed. Survival rate was lower (median days, interquartile range-IQR) among those with atrial fibrillation (531, IQR: 46-2039) vs. non-atrial fibrillation (1808, IQR: 334-3301), p-log rank < 0.0001). Over 12-year follow-up, previous atrial fibrillation was associated with increased mortality: all-cause (multivariable hazard ratios, 1.82; 95% CI: 1.43-2.31) and cardiovascular mortality (multivariable OR, 2.07; 95% CI: 1.36-3.14), but not stroke mortality. In the same multivariable models, oral anticoagulant use was inversely associated with all-cause mortality (oral anticoagulant time-dependent effect: multivariable hazard ratios, 0.47; 95% CI: 0.30-0.50, p = 0.002) and stroke mortality (oral anticoagulant time-dependent effect ≥ 6 months: multivariable OR, 0.09; 95% CI: 0.01-0.65, p-value = 0.02), but not cardiovascular mortality. Among individuals with low socioeconomic status, atrial fibrillation was an independent predictor of poor survival, increasing all-cause and cardiovascular mortality risk. Long-term oral anticoagulant use was associated with a markedly reduced risk of all-cause and stroke mortality.

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