Successful use of emicizumab in a patient with refractory acquired hemophilia A and acute coronary syndrome requiring percutaneous coronary intervention

Essentials Acquired hemophilia A is a rare bleeding disorder often accompanied by other comorbidities. We describe emicizumab use in acquired hemophilia A complicated by acute coronary syndrome. Emicizumab proved safe and effective in a patient with acquired hemophilia A. Emicizumab facilitated successful administration of dual antiplatelet therapy. Abstract We report a patient with a high‐titer factor VIII inhibitor refractory to immunosuppression. He initially presented with myocardial infarction requiring percutaneous coronary intervention (PCI) with bare metal stent placement. Despite Feiba prophylaxis, inadequate hemostasis prompted premature discontinuation of dual antiplatelet therapy (DAPT). Fifteen weeks later, the patient presented with a left anterior descending artery in‐stent restenosis. This case report examines the Key Clinical Question of how to manage in‐stent restenosis in a patient with acquired hemophilia A (AHA). After multidisciplinary discussions including hematology, cardiology, cardiac surgery, laboratory medicine, and pharmacy, emicizumab was initiated to facilitate PCI. Four weeks after emicizumab initiation, the patient underwent successful PCI with drug‐eluting stent placement. Five months after discharge, he remains without signs or symptoms of cardiac disease or bleeding on DAPT and emicizumab. This case provides evidence of the potential of emicizumab for bleeding prophylaxis in AHA.