Why should Vitamin K be closely monitored in patients on 3-in-1 PN and warfarin therapy?

Why should Vitamin K be closely monitored in patients on 3-in-1 PN and warfarin therapy?

• A. It can partially reverse Warfarin, so INR should be monitored during transitions
• B. It increases blood sugar
• C. It reduces lipid absorption
• D. It has no interaction with Warfarin

Answer: (A)

Vitamin K directly affects how Warfarin works. Warfarin blocks the recycling of vitamin K, which is needed to activate several clotting factors. When vitamin K delivery increases, Warfarin’s effect is partly reversed, lowering the INR; when vitamin K delivery decreases, Warfarin’s effect strengthens, raising the INR. In a patient on a 3-in-1 PN, the vitamin K content can change during transitions (for example, when the PN composition or dosing is adjusted), so the anticoagulant effect can shift. Because of this, INR should be monitored closely during transitions and Warfarin doses adjusted to keep anticoagulation in the desired range.

Vitamin K directly affects how Warfarin works. Warfarin blocks the recycling of vitamin K, which is needed to activate several clotting factors. When vitamin K delivery increases, Warfarin’s effect is partly reversed, lowering the INR; when vitamin K delivery decreases, Warfarin’s effect strengthens, raising the INR. In a patient on a 3-in-1 PN, the vitamin K content can change during transitions (for example, when the PN composition or dosing is adjusted), so the anticoagulant effect can shift. Because of this, INR should be monitored closely during transitions and Warfarin doses adjusted to keep anticoagulation in the desired range.