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Abstract
An association has been reported between factor VIII and arterial thrombosis such as ischemic stroke and myocardial infarction. We report a 36-year-old man who had a myocardial infarction despite lacking traditional cardiac risk factors. He developed end-stage heart failure and renal insufficiency necessitating a HeartMate II left ventricular assist device (LVAD). While on the transplant list, he experienced two episodes of LVAD thrombosis 6 months apart, prompting device exchange and escalation of anticoagulation therapy. He eventually underwent a successful heart-kidney transplant before suffering an extensive left lower extremity deep vein thrombosis 6 weeks later. A thrombophilia workup revealed elevated factor VIII activity of 319% (normal range, 50%–150%). He was placed on indefinite anticoagulation with apixaban with no further thrombotic episode in 18 months of follow-up to date.