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Examining Warfarin Dosing Decisions to Improve Anticoagulation Management
Bo Kim1, Omair A Shaikh2, Adam J Rose1,3
1Bedford VA Medical Center, Bedford, MA, USA.
Summary
Warfarin dosing algorithms improve anticoagulation control, but adherence is challenging. This study found significant deviations from recommended warfarin management at VA anticoagulation clinics, highlighting a need for quality assurance.
Area of Science:
- Clinical Pharmacy
- Pharmacoeconomics
- Health Services Research
Background:
- Adherence to warfarin dosing algorithms improves anticoagulation and reduces adverse events.
- Consistent clinical use of these algorithms remains a significant challenge.
Purpose of the Study:
- To analyze warfarin management practices at anticoagulation clinics against algorithm recommendations.
- To develop a quality assurance methodology for warfarin management.
Main Methods:
- Review of 2711 clinician notes from 481 patients across 5 VA sites (Oct 2011-Mar 2012).
- Focus on warfarin dosing decisions post-international normalized ratio (INR) measurement.
Main Results:
- 45% of appointments showed dosing decisions discordant with algorithm recommendations.
- Discordance was more frequent with out-of-range INR values (78%).
- Distinct site-specific "signatures of care" with consistent management patterns were identified, including variations in dose changes and follow-up intervals.
Conclusions:
- Five distinct management patterns were observed across five sites, with none fully adhering to clinical guidelines.
- The developed methodology can serve as a basis for audit and feedback to enhance guideline-concordant warfarin management and improve patient outcomes.
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