A 32-year-old female presents with a 4-week history of worsening fatigue, generalized itching, dark urine, and pale stools. She denies alcohol use or recent travel. On examination, she has scleral icterus and mild right upper quadrant tenderness. Laboratory tests reveal elevated bilirubin (predominantly direct), elevated alkaline phosphatase, and mildly elevated AST/ALT. Which of the following is the most likely cause of her symptoms?
- ACholedocholithiasis.
- BGilbert's syndrome.
- CAcute viral hepatitis.
- DAlcoholic hepatitis.
Show answer & explanationAnswer & explanation
Correct answer: A. Choledocholithiasis.
The patient's symptoms of pruritus, dark urine, pale stools, scleral icterus, elevated direct bilirubin, and significantly elevated alkaline phosphatase are classic signs of cholestasis, indicating an obstruction of bile flow. Choledocholithiasis (gallstones in the common bile duct) is a common cause of such an obstruction. Acute viral hepatitis typically presents with predominantly hepatocellular injury (very high AST/ALT) and less pronounced cholestasis, while Gilbert's syndrome causes unconjugated hyperbilirubinemia, and alcoholic hepatitis would have a history of alcohol use and a different lab pattern.
Why the other options are wrong
- B. Gilbert's syndrome causes unconjugated hyperbilirubinemia and is typically asymptomatic, without pruritus, dark urine, or pale stools.
- C. Acute viral hepatitis typically causes very high AST/ALT and predominantly conjugated hyperbilirubinemia, but the pronounced pruritus and pale stools point more towards cholestasis.
- D. Alcoholic hepatitis would have a history of significant alcohol use, and typically presents with a different ratio of AST to ALT (AST:ALT ratio usually >2:1), and less prominent cholestasis initially.
Cholestasis
Cholestasis is a condition where bile flow from the liver is reduced or blocked, leading to accumulation of bilirubin and other bile components in the blood.
- Symptoms: pruritus, jaundice, dark urine, pale stools.
- Lab findings: elevated direct bilirubin, significantly elevated alkaline phosphatase.
- Causes include gallstones, tumors, primary biliary cholangitis.
Memory trick: Cholestasis: Itchy, Dark, Pale, High Alk Phos