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ARTICLE

Clinical Impact of Bleeding in Patients Taking Oral Anticoagulant Therapy for Venous Thromboembolism

A Meta-Analysis

right arrow Lori-Ann Linkins, MD, FRCP(C); Peter T. Choi, MD, MSc, FRCP(C); and James D. Douketis, MD, FRCP(C)

2 December 2003 | Volume 139 Issue 11 | Pages 893-900

Background: Clinicians should consider the clinical impact of anticoagulant-related bleeding when deciding on the duration of anticoagulant therapy in patients with venous thromboembolism.

Purpose: To provide reliable estimates of the clinical impact of anticoagulant-related bleeding, defined as the case-fatality rate of major bleeding and the risk for intracranial bleeding.

Data Sources: MEDLINE (January 1989 to May 2003), Cochrane Controlled Trial Registry, thromboembolism experts, and reference lists; English-language literature only.

Study Selection: Randomized, controlled trials and prospective cohort studies that investigated patients with venous thromboembolism who received oral anticoagulant therapy (target international normalized ratio, 2.0 to 3.0) for at least 3 months and that reported major bleeding and death as primary study outcomes.

Data Extraction: Two reviewers independently extracted data on the number of anticoagulant-related major and intracranial bleeding episodes and on whether these events were fatal or nonfatal.

Data Synthesis: The authors analyzed 33 studies involving 4374 patient-years of oral anticoagulant therapy. For all patients, the case-fatality rate of major bleeding was 13.4% (95% CI, 9.4% to 17.4%) and the rate of intracranial bleeding was 1.15 per 100 patient-years (CI, 1.14 to 1.16 per 100 patient-years). For patients who received anticoagulant therapy for more than 3 months, the case-fatality rate of major bleeding was 9.1% (CI, 2.5% to 21.7%), and the rate of intracranial bleeding was 0.65 per 100 patient-years (CI, 0.63 to 0.68 per 100 patient-years) after the initial 3 months of anticoagulation.

Conclusion: The clinical impact of anticoagulant-related major bleeding in patients with venous thromboembolism is considerable, and clinicians should take this into account when deciding whether to continue long-term oral anticoagulant therapy in an individual patient.


Editors' Notes
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Context

  • Clinical impact of bleeding from long-term oral anticoagulation for venous thromboembolism is not well quantified.

Contribution

  • This summary of prospective studies involving patients with venous thromboembolism showed that in studies with more than 6 months of follow-up, the rates of major and intracranial bleeding were 2.06% and 1.48% during the initial 3 months of anticoagulation. After 3 months, the rates of major and intracranial bleeding per 100 patient-years were 2.74 and 0.65, respectively. The case-fatality rate of major bleeding before and after 3 months of anticoagulation was 9.3% (95% CI, 3.1% to 20.3%) and 9.1% (CI, 2.5% to 21.7%), respectively.

Implications

  • Extended-duration oral anticoagulation for venous thromboembolism is associated with significant risk for bleeding.

–The Editors

 

Author and Article Information
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From McMaster University, Hamilton, Ontario, Canada; and University of British Columbia, Vancouver, British Columbia, Canada.

Acknowledgments: The authors thank Drs. Clive Kearon, Mark Crowther, Lehana Thabane, and Jack Hirsh for their helpful reviews of the manuscript.

Grant Support: Dr. Linkins is the recipient of a Fellowship Award from the Heart & Stroke Scientific Research Corporation of Canada/AstraZeneca Canada, Inc. Dr. Douketis is a recipient of a Research Scholarship from the Heart and Stroke Foundation of Canada.

Potential Financial Conflicts of Interest: None disclosed.

Requests for Single Reprints: James D. Douketis, MD, FRCP(C), St. Joseph's Healthcare, Room F-541, 50 Charlton Avenue East, Hamilton, Ontario L8N 4A6, Canada; e-mail, jdouket{at}mcmaster.ca.

Current Author Addresses: Dr. Linkins: Henderson Research Centre, Room 220, 711 Concession Street, Hamilton, Ontario L8V 1C3, Canada.

Dr. Choi: Department of Anesthesia, University of British Columbia, 2329 West Mall, Vancouver V6T 1Z4, British Columbia.

Dr. Douketis: St. Joseph's Healthcare, Room F-541, 50 Charlton Avenue East, Hamilton, Ontario L8N 4A6, Canada.

Author Contributions: Conception and design: L.A. Linkins, J.D. Douketis.

Analysis and interpretation of the data: L.A. Linkins, P.T. Choi, J.D. Douketis.

Drafting of the article: L.A. Linkins, J.D. Douketis.

Critical revision of the article for important intellectual content: L.A. Linkins, P.T. Choi, J.D. Douketis.

Final approval of the article: L.A. Linkins, P.T. Choi, J.D. Douketis.

Statistical expertise: P.T. Choi.

Administrative, technical, or logistic support: J.D. Douketis.

Collection and assembly of data: L.A. Linkins.


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