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J Am Heart Assoc. 2021 Nov 02;10(21):e022363. doi: 10.1161/JAHA.121.022363. Epub 2021 Oct 20.

Re-CHARGE-AF: Recalibration of the CHARGE-AF Model for Atrial Fibrillation Risk Prediction in Patients With Acute Stroke.

Journal of the American Heart Association

Jeffrey M Ashburner, Xin Wang, Xinye Li, Shaan Khurshid, Darae Ko, Ana Trisini Lipsanopoulos, Priscilla R Lee, Taylor Carmichael, Ashby C Turner, Corban Jackson, Patrick T Ellinor, Emelia J Benjamin, Steven J Atlas, Daniel E Singer, Ludovic Trinquart, Steven A Lubitz, Christopher D Anderson

Affiliations

  1. Division of General Internal Medicine Massachusetts General Hospital Boston MA.
  2. Department of Medicine Harvard Medical School Boston MA.
  3. Cardiovascular Research Center Massachusetts General Hospital Boston MA.
  4. Division of Cardiology Massachusetts General Hospital Boston MA.
  5. Section of Cardiovascular Medicine Boston University School of Medicine Boston MA.
  6. Department of Neurology Massachusetts General Hospital & Harvard Medical School Boston MA.
  7. Jackson Heart StudyTougaloo College Tougaloo MS.
  8. Cardiac Arrhythmia Service Massachusetts General Hospital Boston MA.
  9. Boston University and National HeartLung, and Blood Institute's Framingham Heart Study Framingham MA.
  10. Department of Medicine Department of Epidemiology Sections of Preventive Medicine and Cardiovascular Medicine Boston University School of MedicineBoston University School of Public Heath Boston MA.
  11. Department of Biostatistics Boston University School of Public Health Boston MA.
  12. Department of Neurology Brigham and Women's Hospital Boston MA.

PMID: 34666503 PMCID: PMC8751842 DOI: 10.1161/JAHA.121.022363

Abstract

Background Performance of existing atrial fibrillation (AF) risk prediction models in poststroke populations is unclear. We evaluated predictive utility of an AF risk model in patients with acute stroke and assessed performance of a fully refitted model. Methods and Results Within an academic hospital, we included patients aged 46 to 94 years discharged for acute ischemic stroke between 2003 and 2018. We estimated 5-year predicted probabilities of AF using the Cohorts for Heart and Aging Research in Genomic Epidemiology for Atrial Fibrillation (CHARGE-AF) model, by recalibrating CHARGE-AF to the baseline risk of the sample, and by fully refitting a Cox proportional hazards model to the stroke sample (Re-CHARGE-AF) model. We compared discrimination and calibration between models and used 200 bootstrap samples for optimism-adjusted measures. Among 551 patients with acute stroke, there were 70 incident AF events over 5 years (cumulative incidence, 15.2%; 95% CI, 10.6%-19.5%). Median predicted 5-year risk from CHARGE-AF was 4.8% (quartile 1-quartile 3, 2.0-12.6) and from Re-CHARGE-AF was 16.1% (quartile 1-quartile 3, 8.0-26.2). For CHARGE-AF, discrimination was moderate (C statistic, 0.64; 95% CI, 0.57-0.70) and calibration was poor, underestimating AF risk (Greenwood-Nam D'Agostino chi-square,

Keywords: atrial fibrillation; ischemic stroke; predicted risk

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