Below is a complete paediatrics reference on Liver Disorders in Children, focusing on hereditary hyperbilirubinemia, neonatal cholestasis, metabolic liver diseases, Wilson disease, and glycogen storage disorders. (No images included as requested.)
Liver Disorders in Children (Paediatrics)
1. Overview
Liver disorders in children include a wide spectrum ranging from genetic metabolic defects to neonatal cholestasis and inherited bilirubin metabolism disorders. These conditions often present with:
- Jaundice
- Hepatomegaly
- Failure to thrive
- Coagulopathy
- Metabolic abnormalities
Early diagnosis is critical to prevent progressive liver damage, cirrhosis, or systemic complications.
1. Hereditary Hyperbilirubinemia
Hereditary hyperbilirubinemia refers to genetic disorders affecting bilirubin metabolism, conjugation, or transport.
They are classified into:
Unconjugated Hyperbilirubinemia
- Crigler–Najjar syndrome
- Gilbert syndrome
Conjugated Hyperbilirubinemia
- Dubin–Johnson syndrome
- Rotor syndrome
Crigler–Najjar Syndrome
Definition
A rare autosomal recessive disorder characterized by severe unconjugated hyperbilirubinemia due to deficiency of UDP-glucuronyl transferase (UGT1A1).
Pathophysiology
Normally bilirubin is conjugated in hepatocytes by UGT1A1 enzyme.
Defect →
Unconjugated bilirubin accumulates →
Crosses blood-brain barrier →
Kernicterus
Two types exist.
Type I
Complete absence of enzyme.
Type II
Partial deficiency.
Causes / Genetics
Mutation in UGT1A1 gene.
Clinical Features
Type I
- Severe neonatal jaundice
- Bilirubin often >20–25 mg/dL
- Risk of kernicterus
- Neurologic damage
Type II
- Mild to moderate jaundice
- Lower risk of kernicterus
- Often discovered later
Investigations
- Serum bilirubin (unconjugated predominance)
- Liver enzymes usually normal
- Genetic testing
- Phenobarbital response test
Differential Diagnosis
- Physiologic jaundice
- Breast milk jaundice
- Hemolysis
- Gilbert syndrome
Management
Phototherapy
Used especially in Type I.
Exchange transfusion
Used in severe neonatal hyperbilirubinemia.
Phenobarbital
Stimulates enzyme activity in Type II.
Drug Details:
Phenobarbital
Indication
Type II Crigler–Najjar
Mechanism
Induces UGT enzyme activity
Dose
3–5 mg/kg/day orally
Adverse Effects
Sedation
Behavioral changes
Cognitive effects
Contraindications
Severe respiratory depression
Monitoring
Liver function tests
Counselling
Long-term therapy may be required.
Liver Transplant
Definitive treatment for Type I disease.
Gilbert Syndrome
Definition
A benign inherited disorder causing mild intermittent unconjugated hyperbilirubinemia due to decreased UGT activity.
Pathophysiology
Reduced activity of UGT1A1 enzyme.
Triggers increase bilirubin.
Triggers
- Fasting
- Stress
- Infection
- Exercise
- Dehydration
Clinical Features
- Mild jaundice
- Usually asymptomatic
- No hepatomegaly
Investigations
- Mild bilirubin elevation (<3 mg/dL)
- Normal LFTs
- Diagnosis mainly clinical
Management
No treatment required.
Patient counselling:
- Avoid prolonged fasting
- Condition is benign
Dubin–Johnson Syndrome
Definition
A rare autosomal recessive disorder causing conjugated hyperbilirubinemia due to impaired bilirubin excretion.
Pathophysiology
Defect in MRP2 transporter responsible for bilirubin secretion into bile.
Results in accumulation of conjugated bilirubin.
Characteristic Feature
Black pigmented liver.
Clinical Features
- Mild jaundice
- Dark liver pigmentation
- Usually asymptomatic
Investigations
- Conjugated hyperbilirubinemia
- Urinary coproporphyrin pattern abnormal
Management
No specific treatment needed.
Prognosis is excellent.
Rotor Syndrome
Definition
A rare benign disorder causing conjugated hyperbilirubinemia due to defects in hepatic storage of bilirubin.
Pathophysiology
Defect in OATP transport proteins responsible for bilirubin uptake.
Clinical Features
- Mild jaundice
- No liver pigmentation
- Usually asymptomatic
Investigations
- Elevated conjugated bilirubin
- Increased urinary coproporphyrin
Management
No treatment required.
2. Neonatal Cholestasis
Definition
Neonatal cholestasis is defined as direct bilirubin >1 mg/dL or >20% of total bilirubin in infants.
It indicates impaired bile flow.
Causes
Extrahepatic
- Biliary atresia
- Choledochal cyst
Intrahepatic
- Neonatal hepatitis
- Metabolic diseases
- Infections
- Genetic disorders
Pathophysiology
Reduced bile flow →
Accumulation of bile acids →
Liver injury → fibrosis
Clinical Features
- Persistent jaundice >2 weeks
- Pale stools
- Dark urine
- Hepatomegaly
- Failure to thrive
Investigations
Laboratory
- Direct bilirubin
- ALT / AST
- Alkaline phosphatase
- GGT
Imaging
- Ultrasound
- HIDA scan
Other tests
- Liver biopsy
- Genetic testing
Management
Nutritional Support
High calorie diet.
Fat soluble vitamins
Vitamin A, D, E, K
Ursodeoxycholic Acid
Mechanism
Improves bile flow.
Dose
10–20 mg/kg/day.
Adverse effects
Diarrhea
Abdominal discomfort
Monitoring
Liver function tests.
Surgical Treatment
Kasai portoenterostomy for biliary atresia.
Early surgery before 8 weeks of age improves prognosis.
3. Metabolic Liver Diseases
Metabolic diseases often present with:
- Neonatal jaundice
- Hypoglycemia
- Hepatomegaly
- Developmental delay
Examples include:
- Wilson disease
- Glycogen storage disease
- Galactosemia
- Tyrosinemia
Wilson Disease
Definition
An autosomal recessive disorder of copper metabolism leading to copper accumulation in liver, brain, and other organs.
Gene
Mutation in ATP7B gene.
Pathophysiology
Defective copper transport →
Reduced ceruloplasmin →
Copper accumulation in hepatocytes →
Liver damage.
Clinical Features
Hepatic
- Hepatitis
- Cirrhosis
- Hepatomegaly
Neurological
- Tremors
- Dysarthria
- Dystonia
Psychiatric
- Personality changes
- Depression
Eye sign
Kayser–Fleischer ring
Investigations
- Serum ceruloplasmin ↓
- Serum copper ↓
- Urinary copper ↑
- Liver biopsy
- Genetic testing
Differential Diagnosis
- Autoimmune hepatitis
- Viral hepatitis
- Nonalcoholic fatty liver disease
Management
Copper Chelation Therapy
Penicillamine
Mechanism
Chelates copper → increases urinary excretion.
Dose
20 mg/kg/day orally.
Adverse effects
Bone marrow suppression
Rash
Proteinuria
Monitoring
CBC
Urine protein
Liver function
Contraindications
Hypersensitivity.
Counselling
Take on empty stomach.
Zinc Therapy
Zinc acetate
Mechanism
Blocks intestinal copper absorption.
Dose
25–50 mg three times daily.
Adverse Effects
GI upset.
Monitoring
Copper levels.
Liver Transplant
For acute liver failure or advanced cirrhosis.
4. Glycogen Storage Disorders (GSD)
Definition
A group of inherited disorders characterized by defects in enzymes of glycogen metabolism.
Results in abnormal glycogen accumulation.
Important Types in Children
Type I – Von Gierke disease
Defect in glucose-6-phosphatase
Type III – Cori disease
Defect in debranching enzyme
Type IV – Andersen disease
Defect in branching enzyme
Type VI – Hers disease
Defect in liver phosphorylase
Pathophysiology
Defective glycogen breakdown →
Hypoglycemia →
Hepatomegaly →
Metabolic abnormalities.
Clinical Features
- Hepatomegaly
- Severe hypoglycemia
- Lactic acidosis
- Hyperlipidemia
- Growth retardation
Investigations
- Blood glucose
- Lactate
- Lipid profile
- Genetic testing
- Liver biopsy
Management
Dietary Therapy
Frequent feeding.
Uncooked cornstarch therapy provides slow glucose release.
Dose
1–2 g/kg every 4–6 hours.
Avoid fasting
Manage complications
- Hyperlipidemia
- Hyperuricemia
Liver Transplant
In severe cases.
Key Differences Between Major Hereditary Hyperbilirubinemia Disorders
| Disorder | Type of Bilirubin | Enzyme Defect | Severity |
| ---------------------- | ----------------- | ---------------- | -------- |
| Crigler–Najjar Type I | Unconjugated | UGT absent | Severe |
| Crigler–Najjar Type II | Unconjugated | UGT partial | Moderate |
| Gilbert syndrome | Unconjugated | Mild UGT defect | Mild |
| Dubin–Johnson | Conjugated | MRP2 transporter | Mild |
| Rotor syndrome | Conjugated | OATP transporter | Mild |
Key Points (Exam Revision)
- Crigler–Najjar type I → severe kernicterus risk.
- Gilbert syndrome → benign intermittent jaundice.
- Dubin–Johnson → black liver.
- Rotor syndrome → similar but no liver pigmentation.
- Neonatal cholestasis → pale stool + dark urine.
- Wilson disease → Kayser–Fleischer rings + low ceruloplasmin.
- Glycogen storage disease → hepatomegaly + hypoglycemia.
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