a-patient-with-cholestatic-liver-disease-shows-prolonged-prothrombin-time-pt-bru

Question

A patient with cholestatic liver disease shows prolonged prothrombin time (PT), bruising, and low plasma phylloquinone (K1). What mechanism best explains these findings, and what is the appropriate immediate management?

Accepted Answer

Cholestasis reduces bile acid secretion impairing micelle-mediated absorption of vitamin K; treat with parenteral vitamin K and correct underlying bile flow issues while monitoring PT until absorption is restored.

Answer

The findings are diagnostic of vitamin E toxicity causing impaired vitamin K action; immediate high-dose vitamin E antagonists should be administered.

Answer

Low phylloquinone reflects renal loss of vitamin K in urine; start aggressive oral vitamin K because renal excretion will not affect parenteral therapy.

Answer

Liver disease causes overproduction of vitamin K–dependent clotting factors leading to hypercoagulability; immediate anticoagulation is required to prevent thrombosis.