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The WATCHMAN Left Atrial Appendage Closure Device for Atrial Fibrillation
Published on: February 28, 2012
Warfarin for atrial fibrillation. The patient's perspective
M Man-Son-Hing1, A Laupacis, A O'Connor
1Geriatric Assessment Unit, Ottawa Civic Hospital.
Archives of Internal Medicine
|September 9, 1996
Summary
Patients with nonvalvular atrial fibrillation have a lower minimal clinically important difference (MCID) for warfarin therapy than experts suggest. Understanding patient perspectives improves treatment decisions and trial design.
Area of Science:
- Pharmacology and Therapeutics
- Patient-Reported Outcomes
- Clinical Decision Making
Background:
- Warfarin is a key treatment for nonvalvular atrial fibrillation (NVAF) to prevent stroke.
- Determining the minimal clinically important difference (MCID) for warfarin therapy is crucial for patient-centered care.
- Patient perspectives on treatment benefits and risks are vital for effective shared decision-making.
Purpose of the Study:
- To ascertain the MCID of warfarin therapy for NVAF patients.
- To compare two distinct methods for eliciting MCID from patients.
- To evaluate the impact of an educational intervention on patient understanding of stroke risk.
Main Methods:
- Sixty-four NVAF patients receiving warfarin underwent two interviews.
- Two elicitation methods (ping-ponging vs. starting at known efficacy) were randomized.
- A pictorial flip chart was used to educate patients on stroke, bleeding risks, and warfarin therapy.
Main Results:
- The mean MCID was 2.01% reduction in 2-year stroke risk.
- 52% of patients accepted warfarin for a 1% absolute decrease in stroke risk.
- The ping-ponging method yielded a significantly smaller MCID compared to the other method.
Conclusions:
- Patient-derived MCIDs for warfarin in NVAF are lower than clinician-implied values.
- The flip chart intervention improved patient knowledge of their condition and treatment.
- The elicitation method significantly influences MCID, impacting clinical decision-making and trial design.
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