Management of Massive Hepatomegaly in Neonates

Initial Assessment and Stabilization

• The American Academy of Pediatrics recommends immediate assessment for life-threatening causes and initiation of prostaglandin infusion if shock is present until congenital heart disease is excluded by echocardiography, providing cardiovascular support during fluid resuscitation, and avoiding biopsy until the infant is clinically stabilized 1, 2, 3
• The Society of Critical Care Medicine suggests assessing for signs of congestive heart failure, such as tachycardia, respiratory distress, poor perfusion, hepatomegaly with rales, and obtaining urgent echocardiography to exclude structural heart disease and assess for cardiomyopathy 2, 3

Diagnostic Evaluation

• The American College of Medical Genetics recommends obtaining blood glucose, lactate, comprehensive metabolic panel, CBC with differential, PT/INR, and ionized calcium, as well as measuring uric acid, CK, plasma total and free carnitine, acylcarnitine profile, urinalysis, and urine organic acids when hepatomegaly coexists with hypoglycemia 2, 3, 5
• The National Comprehensive Cancer Network suggests performing abdominal ultrasound to assess liver size, texture, focal lesions, and evaluating for hepatic hemangiomas, and screening with ultrasound for hepatic infantile hemangiomas if 5 or more cutaneous hemangiomas are present 1, 3, 4

Specific Life-Threatening Conditions to Exclude

• The American Academy of Pediatrics recommends deferring biopsy in infants <2 months with existing or evolving hepatomegaly until after initiation of therapy and clinical stabilization, and considering propranolol therapy if diagnosis is confirmed and cardiovascular support is optimized 1, 6
• The Society of Critical Care Medicine suggests evaluating for glycogen storage disease type I or III if hypoglycemia is present with hepatomegaly, and distinguishing GSD from fatty acid oxidation disorders by beta-hydroxybutyrate elevation at time of hypoglycemia 3, 5, 7

Monitoring Parameters

• The Society of Critical Care Medicine recommends continuous monitoring of temperature, preductal and postductal pulse oximetry, continuous intra-arterial blood pressure, electrocardiogram, and serial glucose and ionized calcium concentrations 2

Common Pitfalls to Avoid

• The American Academy of Pediatrics warns against failure to distinguish cardiac from metabolic causes, which delays life-saving prostaglandin therapy in ductal-dependent lesions, and overlooking hepatic hemangiomas in infants with multiple cutaneous hemangiomas, which misses opportunity for early treatment before cardiac decompensation 1, 3