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A 58-year-old woman presents with obstructive jaundice secondary to an underlying pancreatic head mass and exhibits significant coagulation abnormalities. Which of the following mechanisms most accurately elucidates the primary cause of coagulation disturbance in this clinical scenario?
Answer Details
✅Correct Answer:A. Impaired absorption of fat-soluble Vitamin K, leading to deficient synthesis of coagulation factors II, VII, IX, and X, and a prolonged International Normalized Ratio (INR).
📝Explanation:
The primary mechanism of coagulation disturbance in obstructive jaundice is the impaired absorption of fat-soluble Vitamin K due to reduced bile flow. This deficiency leads to inadequate hepatic synthesis of Vitamin K-dependent clotting factors (II, VII, IX, X), resulting in a prolonged International Normalized Ratio (INR) and an increased risk of bleeding. This is a well-established pathophysiological principle in gastroenterology and hepatology, consistent with standard medical guidelines.
🔤Memory spark:
K-BLOCK
❌Why Wrong:
BHaemolysis secondary to hypersplenism is not a primary or direct consequence of obstructive jaundice. While hypersplenism can cause thrombocytopenia and contribute to bleeding, it is typically associated with portal hypertension and chronic liver disease, not directly with bile duct obstruction. The primary coagulation defect in obstructive jaundice is factor deficiency, not platelet dysfunction or red cell destruction.
CWhile severe, prolonged obstructive jaundice can eventually lead to hepatocellular dysfunction and liver failure, Vitamin K deficiency is the *initial* and *primary* mechanism of coagulopathy. Liver failure would cause a more global synthetic dysfunction affecting many factors, but Vitamin K deficiency is specific and occurs earlier due to malabsorption, even with preserved liver synthetic function.
DHepatorenal syndrome is a severe complication of advanced liver disease, characterized by acute kidney injury. While it indicates severe systemic illness and can be associated with other coagulation abnormalities (like DIC in severe sepsis), it does not directly cause the Vitamin K-dependent factor deficiency seen in obstructive jaundice. The primary effect of hepatorenal syndrome is on renal function, not directly on the synthesis of clotting factors.
🏥Setting:
Tertiary Care / Surgical Ward
⏰Urgency:
Urgent
🎯Learning Objective:
Understand pathophysiology of coagulopathy in obstructive jaundice and its clinical implications for management.
🗝️Key Teaching:
Obstructive jaundice impairs fat-soluble vitamin absorption; Vitamin K deficiency affects clotting factors II, VII, IX, X; Results in prolonged PT/INR; Correctable with parenteral vitamin K; Check coagulation before surgery in jaundiced patients
💎Clinical Pearls:
Jaundice blocks bile -> no fat absorption -> no vitamin K -> bleeding problems
📖Reference:
Merck Manual of Diagnosis and Therapy, Obstructive Jaundice
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