A 59-Year-Old Woman Comes to the Physician Because of Left

A 59-year-old woman comes to the physician because of left leg swelling that started after a transcontinental flight. A duplex ultrasound of the left leg shows a noncompressible popliteal vein. A drug is prescribed that inhibits the coagulation cascade. Two weeks later, laboratory studies show: Platelet count 210,000/mm3
Partial thromboplastin time 53 seconds
Prothrombin time 20 seconds
Thrombin time 15 seconds (control: 15 seconds)
Which of the following drugs was most likely prescribed?

A) Alteplase
B) Dabigatran
C) Aspirin
D) Unfractionated heparin
E) Apixaban
F) Warfarin
G) Ticagrelor