Conflict of interest: A. T. has received a research grant from AstraZeneca R&D. B. F and K. M. H. are employed at the Epidemiology Department, AstraZeneca R&D. S. Å has no conflict of interest in relation to this study.
Hemorrhage after ischemic stroke – relation to age and previous hemorrhage in a nationwide cohort of 58 868 patients
Article first published online: 14 DEC 2011
© 2011 The Authors. International Journal of Stroke © 2011 World Stroke Organization
International Journal of Stroke
Volume 8, Issue 2, pages 80–86, February 2013
How to Cite
Åsberg, S., Henriksson, K. M., Farahmand, B. and Terént, A. (2013), Hemorrhage after ischemic stroke – relation to age and previous hemorrhage in a nationwide cohort of 58 868 patients. International Journal of Stroke, 8: 80–86. doi: 10.1111/j.1747-4949.2011.00718.x
Funding: Riks-Stroke, the Swedish Stroke Register, is funded by the National Board of Health and Welfare and the Swedish Association of Local Authorities and Regions. S. Å. has received a research scholarship from Stroke-Riksförbundet (the National Association for Stroke Patients in Sweden).
- Issue published online: 21 JAN 2013
- Article first published online: 14 DEC 2011
- National Board of Health and Welfare
- Swedish Association of Local Authorities and Regions
- age groups;
- antiplatelet and anticoagulant treatment for secondary stroke prevention;
- ischemic stroke
In randomized controlled trials of secondary prevention after stroke, the risk of hemorrhage varies between 1% and 5% per year in patients with antithrombotic therapy, i.e. anticoagulants and antiplatelets.
To explore the rate and the risk of hemorrhage after stroke in a nationwide cohort.
We identified 58 868 first ever ischemic stroke patients in the Swedish Stroke Register during 2001 to 2005 (=index stroke) and followed them by record linkage to the National Patient Register. Rates of hemorrhage and hazard ratios, for comparisons of rates between subgroups, were calculated.
Of the 58 586 ischemic stroke patients identified, 5527 (9·4%) had a history of hemorrhage. During follow-up (mean 2·0 years), 2876 patients endured a hemorrhage, giving an average hemorrhage rate of 2·6 (95% confidence interval 2·5–2·7) per 100 person-years. After index stroke, 11% of the patients were discharged with anticoagulants, and 79% with antiplatelets. Given the differences in baseline characteristics, the hemorrhage rates (per 100 person-years) were 2·5 (95% confidence interval 2·2–2·8), 2·4 (95% confidence interval 2·3–2·5), and 3·8 (95% confidence interval 3·5–4·2) in patients prescribed anticoagulants, antiplatelets, and no antithrombotics, respectively. There was an increased risk of hemorrhage in patients ≥75 years compared with those <75 years (hazard ratio = 1·61, 95% confidence interval 1·49–1·73) and in patients with previous hemorrhages compared with those without (hazard ratio = 1·82, 95% confidence interval 1·64–2·02).
When antithrombotics were used in large-scale clinical practice, the observed rates of hemorrhage were similar with anticoagulant therapy but increased with antiplatelet therapy compared with rates reported in randomized controlled trials. Old age and previous hemorrhage were associated with an increased risk of hemorrhage after an ischemic stroke.