Liver Cell Failure in Pediatric Patients

Clinical Signs and Pathophysiology

• The American Association for the Study of Liver Diseases recommends that pediatric liver cell failure be identified by a constellation of clinical signs reflecting impaired hepatic synthetic function, detoxification capacity, and metabolic derangements, with manifestations varying significantly by age and underlying etiology 1, 2
• Jaundice is often the first recognized sign, typically appearing at 1-2 months of life in infants with liver dysfunction, characterized by elevated conjugated bilirubin levels 3, 4
• Prolonged neonatal jaundice beyond the physiologic period should prompt evaluation for liver disease 3
• Pruritus can be severe and intractable, significantly impacting quality of life even when liver synthetic function is relatively preserved 1, 2
• Coagulopathy manifests as bleeding diathesis including gastrointestinal bleeding, umbilical stump bleeding, easy bruising, or rarely CNS hemorrhage 3, 4
• Hypoalbuminemia contributes to ascites formation and edema 1
• Uncorrectable coagulopathy despite vitamin K administration indicates severe hepatocellular dysfunction 1, 2
• Hepatomegaly is commonly detected on physical examination, often accompanied by splenomegaly in advanced disease 3, 1
• Ascites results from portal hypertension, vasodilation, hyperaldosteronism, and hypoalbuminemia 1
• Variceal hemorrhage represents a life-threatening complication of portal hypertension 1, 2
• Failure to thrive and poor weight gain despite adequate caloric intake due to hypermetabolism and malabsorption 3, 1, 5
• Growth failure reflects chronic malnutrition and metabolic dysfunction 1, 2
• Fat-soluble vitamin deficiencies (A, D, E, K) due to cholestasis 1
• Hepatic encephalopathy ranging from subtle behavioral changes to coma, though may be subclinical in neonates 6
• Advancing encephalopathy indicates deteriorating hepatic function requiring urgent transplant evaluation 1, 2
• Elevated serum transaminases (ALT, AST) indicating hepatocellular injury, which may persist for years 3, 4
• Elevated conjugated bilirubin distinguishing hepatocellular from hemolytic causes 3, 4
• Prolonged INR/PT reflecting impaired synthesis of clotting factors 6
• Coagulation factor deficiency results from reduced hepatic synthesis of vitamin K-dependent factors (II, VII, IX, X) and factor V 3, 4
• Hypoalbuminemia develops from decreased hepatic albumin synthesis, contributing to oncotic pressure changes 1
• Impaired bile formation and excretion leads to accumulation of conjugated bilirubin and bile acids 3, 4
• Bile acid retention causes pruritus through direct neuronal stimulation 1
• Cholestasis impairs fat-soluble vitamin absorption, leading to deficiency states including vitamin K deficiency 3, 1
• Progressive hepatic fibrosis and cirrhosis increase intrahepatic vascular resistance 1
• Portal hypertension triggers splanchnic vasodilation and activation of the renin-angiotensin-aldosterone system 1
• Hyperaldosteronism promotes sodium and water retention, contributing to ascites formation 1
• Portosystemic collaterals develop, including esophageal varices 1
• Hypermetabolism in chronic liver disease increases caloric requirements by 20-80% above normal 5
• Malabsorption of fats and fat-soluble vitamins due to reduced bile acid secretion 1, 5
• Hepatorenal syndrome develops from renal vasoconstriction in the setting of splanchnic vasodilation 1
• Hepatopulmonary syndrome results from intrapulmonary vascular dilatations 1