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Stroke and death in elderly patients with atrial fibrillation in Japan compared with the United Kingdom
  1. Keitaro Senoo1,
  2. Yoshimori An2,
  3. Hisashi Ogawa2,
  4. Deirdre A Lane1,
  5. Andreas Wolff3,
  6. Eduard Shantsila1,
  7. Masaharu Akao2,
  8. Gregory Y H Lip1,4
  1. 1University of Birmingham Institute of Cardiovascular Sciences, City Hospital, Birmingham, UK
  2. 2Department of Cardiology, National Hospital Organization Kyoto Medical Center, Kyoto, Japan
  3. 3Division of Family Practice, Chilliwack General Hospital, Chilliwack, British Columbia, Canada
  4. 4Aalborg Thrombosis Research Unit, Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
  1. Correspondence to Professor Gregory Y H Lip, University of Birmingham Institute of Cardiovascular Sciences, City Hospital, Dudley Road, Birmingham B18 7QH, UK; g.y.h.lip{at}


Background Data on stroke, mortality and associated comorbidities in elderly patients with atrial fibrillation (AF) in Japan may differ from Western countries. There have been few systematic comparisons between stroke risk profiles and outcomes among community-based elderly (aged ≥75 years) patients with AF in Japan and the UK.

Objective and methods We compared clinical characteristics, stroke risk and outcomes among elderly patients with AF from the Fushimi AF Registry (Japan; N=1791) and the Darlington AF Registry (UK; N=1338).

Results The Fushimi cohort had a mean age 81.8 (standard deviation (SD) 5.3) years and CHA2DS2-VASc (congestive heart failure, hypertension, age ≥75 years (double), diabetes mellitus, previous thromboembolism (double), vascular disease, age 65–74 years and female gender) score 4.3 (1.4), whereas the Darlington cohort had a mean age 83.6 (5.7) years and CHA2DS2-VASc score 4.4 (1.4). Over a 12-month follow-up period, observed stroke and mortality rates in Fushimi were 3.4% (n=61) and 11.5% (n=206), while corresponding event rates in the Darlington cohort were 4.4% (n=59) and 14.1% (n=188), respectively. Appropriate use of oral anticoagulation (OAC, essentially a vitamin K antagonist) was <60% in both registries.

On multivariable analysis, ethnicity (Japan vs UK) was neither associated with the risk of stroke (OR 0.92, 95% CI 0.63 to 1.36; p=0.69) nor death (OR 0.92, 95% CI 0.80 to 1.27; p=0.92). In a subgroup analysis of elderly patients not receiving OAC (n=1489), a history of stroke was associated with the risk of stroke (OR 2.42, 95% CI 1.39 to 4.12; p=0.002), but not ethnicity (OR 0.86, 95% CI 0.50 to 1.47; p=0.58).

Conclusions Elderly (age ≥75 years) patients with AF in both Japan and the UK are at similarly high risk of stroke and death, with OAC still underused in both populations. Ethnicity was not independently associated with the risk of stroke, regardless of OAC use or non-use.

  • Stroke

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