MCQ: Total Parenteral Nutrition| Complication:

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Clinical Scenario:

A 26-week, 780-g infant develops necrotising enterocolitis on day 5 of life and requires prolonged parenteral nutrition because enteral feeds cannot be established. By day 28, he has developed persistent jaundice.

He remains haemodynamically stable. Repeated blood cultures are negative. Abdominal ultrasonography shows no evidence of biliary obstruction.

Laboratory investigations show:

  • Total bilirubin: 86 µmol/L
  • Conjugated bilirubin: 61 µmol/L
  • ALT: mildly elevated
  • GGT: elevated
  • Albumin: normal
  • INR: normal

He has received minimal enteral nutrition and prolonged intravenous lipid-containing parenteral nutrition.

What is the most likely diagnosis?

A. Biliary atresia
B. Haemolytic jaundice
C. Intestinal failure-associated liver disease
D. Neonatal hepatitis
E. Physiological jaundice

Correct answer & Explanation:

Correct answer: C. Intestinal failure-associated liver disease (IFALD)

Explanation

The infant has conjugated hyperbilirubinaemia developing during prolonged PN in the setting of severe intestinal dysfunction and minimal enteral feeding, with no evidence of extrahepatic obstruction or ongoing sepsis. This is characteristic of intestinal failure-associated liver disease (IFALD), historically often termed parenteral nutrition-associated liver disease (PNALD).

A conjugated bilirubin of ≥34 µmol/L (2 mg/dL) is commonly used to define cholestasis in this context. IFALD is broader than PNALD because factors such as intestinal failure, lack of enteral feeding, sepsis and the underlying disease can all contribute to hepatic injury.

NICE recommends weekly liver-function monitoring in neonates receiving PN, with more frequent monitoring when there are concerns or abnormal results.

Why the other options are wrong

  • A. Biliary atresia: should be considered in any infant with conjugated jaundice, but the clinical context and absence of biliary obstruction make IFALD much more likely here.
  • B. Haemolytic jaundice: predominantly causes unconjugated hyperbilirubinaemia.
  • D. Neonatal hepatitis: possible differential diagnosis, but the strong association with prolonged PN, intestinal failure and minimal enteral feeding favours IFALD.
  • E. Physiological jaundice: is unconjugated and does not explain significant conjugated hyperbilirubinaemia at 4 weeks.

 Postgraduate exam pearl

Prolonged PN + intestinal failure + minimal enteral feeding + conjugated hyperbilirubinaemia = IFALD.

One important refinement: I would prefer the term IFALD over PNALD in your website because it reflects the modern understanding that the liver injury is multifactorial rather than caused by PN alone.

References:

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