Optimizing warfarin and dual oral anticoagulation practices in an academic clinic during a merger amid the COVID-19 pandemic in a marginalized population.

Abstract

Background: The closure of a pharmacy-led anticoagulation clinic, which provided point-of-care (POC) international normalized ratio (INR) testing and face-to-face visits, coupled with the transition to an academic physician-led clinic without POC INR testing and reliance on telephone communication, created significant challenges for warfarin management during the Coronavirus disease 2019 pandemic. The aim of this quality control project was to increase the percentage of patients on warfarin within the optimal time in therapeutic range (TTR) from 52.30% to 65.00%, sustain baseline quarterly cumulative percentage TTR to 59.00%, and transition 20% of eligible patients from warfarin to dual oral anticoagulation (DOAC) within 12 months.

Methods: A multidisciplinary team employed a Fishbone diagram, stakeholder analysis, process flow map, and a driver diagram. Significant barriers included knowledge gaps, fear of blood draws, lack of POC INR testing, and noninteroperable electronic health records (EHRs). Primary outcome measures included quarterly cumulative percentage TTR, 2-monthly percentage TTR, and the percentage of eligible patients switched to DOAC. Process measures included INR completion rates. Key interventions involved educating patients and the care team, transitioning patients to DOAC, improving EHRs, and optimizing processes. Data analysis utilized run charts.

Results: Monthly INR completion rates rose from 63% to 87% within 12 months and reached 92% during the 6 months post-project period. Among 143 patients, 40.55% (58) were eligible for a DOAC switch, with 51.72% (30/58) successfully transitioning during the project and the 6-month post-project period. Two-monthly TTR rates improved from the baseline of 52.30% to 62.00% during the study period and remained sustainable at 62.80% in the post-project phase. Quarterly cumulative TTR rates remained stable at 59.20% during the study period in 2021. The quarterly cumulative TTR rates continued to increase at 60.50% and 64.40% in 2022 and 2023, respectively, during the post-project period. No bleeding episodes occurred during the 15-month post-project period.

Conclusion: Multi-faceted strategies significantly improved warfarin safety during the project and maintained these improvements for 24 months. Transitioning from warfarin to DOACs was crucial for optimizing anticoagulation management with limited resources. The lead physician and team used various tools to address barriers to effective warfarin management, ensure appropriate DOAC prescribing, and enhance practices for DOAC prescriptions. This project effectively addressed barriers, improved population health, and provided a model for anticoagulation management in primary care settings.