Liver Diseases in Children

Neonatal Cholestasis - Yellow Baby Riddles

• Definition: Jaundice >14 days (term), >21 days (preterm) + conjugated hyperbilirubinemia (Direct Bilirubin >1 mg/dL if Total Bilirubin <5 mg/dL; OR >20% of Total Bilirubin if Total Bilirubin >5 mg/dL).
• Initial Step: Fractionate bilirubin (conjugated vs. unconjugated).

• Key Conditions:

  Feature	Biliary Atresia (BA)	Neonatal Hepatitis Syndrome (NHS)
  Onset	Progressive, 2-8 weeks	Variable
  Stools	Acholic (clay-colored)	Pigmented / intermittently acholic
  USG	Triangular cord sign, absent/small GB	Normal/small GB, no dilated ducts
  HIDA Scan	No excretion into bowel	Delayed or normal excretion
  Liver Biopsy	Bile duct proliferation, portal fibrosis, bile plugs	Giant cell transformation, inflammation
  Management	Kasai portoenterostomy (ideal <8 weeks), Transplant	Supportive, ursodeoxycholic acid (UDCA)

⭐ Early diagnosis of Biliary Atresia is critical; Kasai portoenterostomy performed before 60 days of age has the best prognosis for establishing bile flow and delaying liver transplantation.

Metabolic Liver Diseases - Inborn Errors Unveiled

Key metabolic liver diseases with genetic underpinnings:

Viral Hepatitis in Children - Tiny Livers Attacked

• Hepatitis A (HAV) & E (HEV):
  • Transmission: Fecal-oral (e.g., contaminated water).
  • Course: Acute, generally self-limiting. ⚠️ HEV can be severe in pregnant women.
  • Prevention: Hygiene, sanitation. HAV vaccine available.
• Hepatitis B (HBV):
  • Transmission: Primarily vertical (mother-to-child); also parenteral.
  • Risk: High chronicity if perinatal (>90%).
  • Markers: HBsAg (infection), HBeAg (high infectivity), Anti-HBs (immunity).
  • Prevention: Universal infant vaccination (birth dose within 24h, then 0, 1, 6 months); HBIG for exposed neonates.
• Hepatitis C (HCV):
  • Transmission: Vertical; parenteral (less common in children).
  • Risk: High chronicity (~50-80%).
  • Management: Screening (anti-HCV Ab, HCV RNA); Direct-Acting Antivirals (DAAs) available.

⭐ Perinatal transmission of HBV results in chronic infection in over 90% of cases.

Acute Liver Failure in Children - Sudden Liver Shock

• Definition: INR ≥1.5 with encephalopathy OR INR ≥2.0 without encephalopathy; no pre-existing liver disease.
• Causes: 📌 Paracetamol toxicity, Autoimmune hepatitis, Viral hepatitis (A,B,E), Metabolic disorders (e.g., Wilson's, tyrosinemia).
• Clinical Features: Jaundice, coagulopathy (↑INR, bleeding), encephalopathy (graded), hypoglycemia, cerebral edema (↑ICP).
• Management Principles: ICU supportive care (glucose, FFP), identify & treat cause (e.g., N-acetylcysteine for paracetamol), manage complications, urgent liver transplant evaluation.

⭐ Paracetamol toxicity is a leading reversible cause of ALF in children; prompt N-acetylcysteine (NAC) administration is life-saving.

Chronic Liver Disease in Children - Long-Term Liver Woes

• Causes: Post-Biliary Atresia, chronic viral hepatitis, metabolic/genetic, autoimmune, NAFLD/MASLD.
• Complications: Portal hypertension (varices, ascites, splenomegaly), hepatic encephalopathy, coagulopathy, malnutrition/growth failure.
• Management: Address complications (diuretics, beta-blockers, nutritional support). PELD/MELD scores guide prognosis.

⭐ Growth failure is a significant and often early complication of CLD in children.

High‑Yield Points - ⚡ Biggest Takeaways

• Neonatal cholestasis: Differentiate biliary atresia (urgent Kasai) from neonatal hepatitis complex.
• Alpha-1 antitrypsin deficiency: PAS-positive, diastase-resistant globules in liver; common genetic cause.
• Wilson's disease: Copper overload; low ceruloplasmin, ↑ urinary copper, K-F rings, neuro-hepatic symptoms.
• Reye's syndrome: Aspirin + viral illness → acute fatty liver & encephalopathy, ↑ ammonia.
• Alagille syndrome: Bile duct paucity, butterfly vertebrae, distinct facies, pulmonary stenosis, cholestasis.
• PFIC: Genetic cholestasis (e.g., ATP8B1, ABCB11, ABCB4); types 1, 2, 3 with distinct gene defects.