Background
Therapeutic anticoagulation is essential for patients with durable left ventricular assist devices (LVADs). While warfarin remains the default anticoagulant of choice, its narrow therapeutic range, multiple pharmacologic interactions, the need for continuous dose adjustments, the limited time in therapeutic range (often <40%) resulting in both thrombotic and hemorrhagic complications, all contribute to patient and provider dissatisfaction. There is limited data exploring alternate anticoagulation strategies in this cohort. We report the safety and efficacy of the direct acting oral anticoagulant (DOAC) apixaban for anticoagulation in patients with the HeartMate (HM) 3 LVAD.
Hypothesis
DOACs offer a safe and effective anticoagulant in patients with durable HM3 LVADs
Methods
We compared thromboembolic and hemorrhagic events between patients with HeartMate 3 LVADs receiving warfarin to those who transitioned from warfarin to a DOAC due to adverse events or labile therapeutic responses on warfarin in our center.
Results
From 2018-2024, we included 47 patients, 16 on warfarin and 31 on apixaban. Cohorts were identical for baseline demographics and estimated risk of bleeding (Table 1). The absolute rate of all-cause bleeding per 100 patient-years was similar (warfarin (33) vs apixaban (29), p=0.24). The relative risk (RR) of major bleeding within the first 3 months of initiating anticoagulation was lower with DOAC - RR 0.08 (95% CI, 0.01 - 0.65, p=0.01) with an incidence of rate of 6.4% on apixaban vs 43.8% on warfarin. All-cause bleeding was less frequent with DOAC at 32% vs 68.8% - RR 0.14 (95% CI 0.03 - 0.62, p=0.009). Thrombotic events were identical. Table 2 summarizes clinical outcomes.
Conclusion
In patients with HM3 LVADs, DOAC might provide a safe and clinically useful alternative to default warfarin.
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