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Alpha-1-antitrypsin deficiency (AATD) causes liver disease in Pi ZZ homozygous children. Many infants with AATD and prolonged neonatal cholestasis develop cirrhosis, with poor prognostic indicators identified.
Area of Science:
- Hepatology
- Pediatric Gastroenterology
- Genetic Liver Diseases
Background:
- Alpha-1-antitrypsin deficiency (AATD) is a genetic disorder that can lead to liver disease, primarily in individuals with the Pi ZZ genotype.
- Liver disease in AATD predominantly affects Pi ZZ homozygous children, presenting with varying severity.
- Neonatal cholestasis is a recognized early manifestation of AATD-related liver disease in infants.
Purpose of the Study:
- To investigate the clinical course and prognostic factors of liver disease in infants with alpha-1-antitrypsin deficiency (AATD) and prolonged neonatal cholestasis.
- To identify specific clinical and histological features associated with poor outcomes, including cirrhosis and mortality.
- To evaluate the effectiveness of current treatment strategies in managing AATD-related cirrhosis in children.
Main Methods:
- Retrospective analysis of 45 Pi ZZ infants diagnosed with prolonged neonatal cholestasis.
- Clinical assessment including jaundice duration, splenomegaly, hepatomegaly, and liver function tests.
- Histological examination for liver fibrosis and bile duct paucity.
- Evaluation of outcomes such as cirrhosis development, portal hypertension, and mortality.
Main Results:
- Twenty-five out of 45 (55.6%) Pi ZZ infants with prolonged neonatal cholestasis developed cirrhosis.
- Poor prognostic indicators included persistent jaundice beyond 6 months, early splenomegaly, hard hepatomegaly, abnormal liver function, and early portal fibrosis.
- The most severe disease course was observed in infants with histological paucity of interlobular bile ducts.
- Portal hypertension was present in 19 of 25 children with cirrhosis, and 8 died during childhood.
Conclusions:
- Prolonged neonatal cholestasis in Pi ZZ infants is a significant risk factor for developing cirrhosis.
- Specific clinical and histological findings are crucial for predicting poor prognosis in AATD-related liver disease.
- While dietary and surgical interventions showed limited benefit, the long-term prognosis for Pi ZZ children with cirrhosis remains unpredictable.
Abstract:
Liver disease related to alpha-1-antitrypsin deficiency occurs only in Pi ZZ homozygous children. Eleven per cent of Pi ZZ infants present with prolonged neonatal cholestasis. In our group, 25 of 45 Pi ZZ infants with prolonged neonatal cholestasis presented with later cirrhosis. Persistence of jaundice beyond the sixth month of age, early development of splenomegaly, persistence of hard hepatomegaly and liver function abnormalities, and early portal fibrosis have a poor prognostic significance. The most severe course occurs in infants with an early histologic pattern of paucity of interlobular bile ducts. Portal hypertension was present in 19 of 25 children presenting with cirrhosis; 8 of 25 Pi ZZ children with cirrhosis died during childhood. Long-term protein-restricted diet and portal systemic shunts were helpful in treatment of four Pi ZZ children with cirrhosis; however, the long-term course in Pi ZZ children with cirrhosis is unpredictable.