Net Clinical Benefit of Antithrombotic Therapy in Patients With Atrial Fibrillation and Chronic Kidney Disease: A Nationwide Observational Cohort Studys

Anders Nissen Bonde, Gregory Y H Lip, Anne-Lise Kamper, Peter Riis Hansen, Morten Lamberts, Kristine Hommel, Morten Lock Hansen, Gunnar Hilmar Gislason, Christian Torp-Pedersen, Jonas Bjerring Olesen

184 Citations (Scopus)

Abstract

Background The balance between stroke reduction and increased bleeding associated with antithrombotic therapy among patients with atrial fibrillation (AF) and chronic kidney disease (CKD) is controversial. Objectives This study assessed the risk associated with CKD in individual CHA2DS2-VASc (Congestive heart failure; Hypertension; Age ≥75 years; Diabetes mellitus; previous Stroke, transient ischemic attack, or thromboembolism; Vascular disease; Age 65 to 74 years; Sex category) strata and the net clinical benefit of warfarin in patients with AF and CKD in a nationwide cohort. Methods By individual-level linkage of nationwide Danish registries, we identified all patients discharged with nonvalvular AF from 1997 to 2011. The stroke risk associated with non-end-stage CKD and end-stage CKD (e.g., patients on renal replacement therapy [RRT]) was estimated using Cox regression analyses. The net clinical benefit of warfarin was assessed using 4 endpoints: a composite endpoint of death/hospitalization from stroke/bleeding; a composite endpoint of fatal stroke/fatal bleeding; cardiovascular death; and all-cause death. RESULTS From nonvalvular AF patients (n = 154,259), we identified 11,128 patients (7.2%) with non-end-stage CKD and 1,728 (1.1%) receiving RRT. In all CHA2DS2-VASc risk groups, RRT was independently associated with a higher risk of stroke/thromboembolism, from a 5.5-fold higher risk in patients with CHA2DS2-VASc score = 0 to a 1.6-fold higher risk in patients with CHA2DS2-VASc score ≥2. In patients receiving RRT with CHA2DS2-VASc score≥2, warfarin was associated with lower risk of all-cause death (hazard ratio [HR]: 0.85, 95% confidence interval [CI]: 0.72 to 0.99). In non-end-stage CKD patients with CHA2DS2-VASc score ≥2, warfarin was associated with a lower risk of a composite outcome of fatal stroke/fatal bleeding (HR: 0.71, 95% CI: 0.57 to 0.88), a lower risk of cardiovascular death (HR: 0.80, 95% CI: 0.74 to 0.88), and a lower risk of all-cause death (HR: 0.64, 95% CI: 0.60 to 0.69). Conclusions CKD is associated with a higher risk of stroke/thromboembolism across stroke risk strata in AF patients. High-risk CKD patients (CHA2DS2-VASc ≥2) with AF benefit from warfarin treatment for stroke prevention.

Original languageEnglish
JournalJournal of the American College of Cardiology
Volume64
Issue number23
Pages (from-to)2471-2482
Number of pages12
ISSN0735-1097
DOIs
Publication statusPublished - 2014

Keywords

  • Aged
  • Anticoagulants
  • Aspirin
  • Atrial Fibrillation
  • Cohort Studies
  • Denmark
  • Female
  • Follow-Up Studies
  • Hemorrhage
  • Hospitalization
  • Humans
  • Male
  • Proportional Hazards Models
  • Registries
  • Renal Insufficiency, Chronic
  • Renal Replacement Therapy
  • Risk Assessment
  • Stroke
  • Thromboembolism
  • Warfarin

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