The model included a hypothetical cohort of patients aged 65 years at an increased risk of stroke due to nonvalvular atrial fibrillation and with no contraindication to anticoagulation. Multiple 1-way and 2-way sensitivity analyses were also constructed to delineate the impact Andexxa would need to have on mortality rates and health-related quality of life to meet the willingness-to-pay thresholds ranging between $50,000 and $150,000. Methods: To explore the cost-effectiveness of Andexxa, a Markov model was generated using existing Andexxa trial data and related literature. Andexxa is costly, however, ranging between US $24,750 and $49,500 for treatment. It has been reported to substantially reduce mortality rates for patients who experience a major bleed while taking rivaroxaban or apixaban. In May 2018, the US Food and Drug Administration approved andexanet alfa (Andexxa), the first known reversal agent for a subset of direct factor Xa inhibitors. Introduction: Tens of thousands of patients die of major life-threatening bleeds every year while taking direct factor Xa inhibitors, a class of anticoagulant medications that until now had no reversal agent.
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