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Review Question - QID 216643

Anticoagulants QID: 216643 (M2.OMB.1)
In scope icon M 5
QID 216643 (Type "216643" in App Search)
A 74-year-old man with a history of atrial fibrillation, gastroesophageal reflux disease, and epilepsy presents to the emergency room due to a 1-day history of gross hematuria and generalized weakness. He has been taking warfarin for 5 years, but has recently started some new medications. On physical exam, his temperature is 98.6°F (37°C), blood pressure is 110/80 mmHg, pulse is 104/min, and respirations are 12/min. Physical exam is notable for conjunctival pallor. Basic lab tests are performed with the following results:

Hemoglobin: 5.4 g/dL
Hematocrit: 16.2%
Platelet count: 250,000/mm^3
PT: 41 seconds
INR: 6.1
Activated PTT: 45 seconds

Recent initiation of which of the following therapies is likely responsible for his presentation?
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