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Published on: February 26, 2013
Cost-Effectiveness of Bridging Anticoagulation Among Patients with Nonvalvular Atrial Fibrillation
Matthew A Pappas1,2, Geoffrey D Barnes3, Sandeep Vijan4
1Center for Value-Based Care Research, Medicine Institute , Cleveland Clinic, Cleveland, OH, USA. pappasm@ccf.org.
Insights
Bridging anticoagulation for atrial fibrillation patients may cause harm. Careful patient selection for outpatient bridging can be beneficial and cost-effective, avoiding hospital admission.
Area of Science:
- Cardiology
- Pharmacoeconomics
- Health Policy
Background:
- Bridging anticoagulation is frequently used for atrial fibrillation patients undergoing warfarin therapy.
- Current guidelines suggest bridging for high-stroke-risk patients, but recent trials indicate potential harm in lower-risk groups.
- Evidence for selecting patients who benefit from bridging based on both stroke and bleeding risks is limited.
Purpose of the Study:
- To assess the utility and cost-effectiveness of bridging anticoagulation in nonvalvular atrial fibrillation patients.
- Stratify analysis by individual thromboembolic and hemorrhagic risks.
- Inform optimal patient selection for bridging therapy.
Main Methods:
- Cost-effectiveness analysis with a lifelong time horizon.
- Utilized quality-adjusted life years (QALYs) and cost per QALY gained.
- Modeled outcomes from a third-party payer perspective.
Main Results:
- Unselected nonvalvular atrial fibrillation patients may experience harm from bridging anticoagulation.
- Hospital admission for bridging is rarely cost-effective and generally detrimental.
- Outpatient bridging demonstrates benefit and cost-effectiveness in carefully selected patients with low bleeding and high thromboembolic risk.
Conclusions:
- Outpatient bridging anticoagulation offers benefits and cost-effectiveness for specific nonvalvular atrial fibrillation patients during warfarin management.
- Hospital admission for bridging should be avoided due to potential harm and poor cost-effectiveness.
Background:
Bridging anticoagulation is commonly prescribed to patients with atrial fibrillation during initiation and interruption of warfarin. Guidelines recommend bridging patients at high risk of stroke, while a recent randomized trial demonstrated overall harm in a population at comparatively low risk of ischemic stroke. Theory suggests that patients at high risk of stroke and low risk of hemorrhage may benefit from bridging, but data informing patient selection are scant.
Objective:
To estimate the utility and cost-effectiveness of bridging anticoagulation among patients with nonvalvular atrial fibrillation, stratified by thromboembolic and hemorrhagic risk DESIGN: Cost-effectiveness analysis with lifelong time horizon, from the perspective of a third-party payer MAIN MEASURES: Quality-adjusted life years (QALYs) per bridged patient; US dollars per QALY gained KEY RESULTS: Unselected patients with nonvalvular atrial fibrillation may be harmed by bridging anticoagulation. Hospital admission for bridging is almost never cost-effective, and generally harmful. Among patients carefully selected by both thromboembolic and hemorrhagic risks, outpatient bridging can be beneficial and cost-effective. Results were sensitive to how effectively heparin products reduce stroke risk.
Conclusions:
Outpatient bridging anticoagulation can be beneficial and cost-effective for a subset of patients with nonvalvular atrial fibrillation during interruption or initiation of warfarin. Admission for bridging should be avoided.
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