A patient who has been on warfarin for atrial fibrillation

A patient who has been on warfarin for atrial fibrillation presents to the emergency department after a motor vehicle accident in which he sustained head injury. There is a large subdural hematoma which is compressing and displacing the left side of his brain. There is also profuse bleeding from his left ear. The emergency physician decides to give him a vitamin urgently to help reverse the effect of warfarin. Which of the following enzymes does the vitamin depend on for activation?

  • A. Epoxide reductase
  • B. Lysyl hydroxylase
  • C. Phosphofructokinase-1
  • D. Acetyl CoA carboxylase

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