Estimating autoimmune hepatitis in patients with hepatic dysfunction.

Unlabelled: Autoimmune Hepatitis (AIH) is a chronic inflammatory disease of the liver of unknown aetiology characterized by polyclonal hypergammaglobulinemia and circulating autoantibodies. Objective of the study is to find out the prevalence of autoimmune hepatitis and its causative autoantibody (Anti-nuclear, anti-smooth muscle, anti-liver kidney microsomes-1) following comprehensive diagnostic criteria given by International Autoimmune Hepatitis Group.

Material And Methods: 250 patients with raised aminotransferase but, negative for the commonest three clinical conditions viz, viral hepatitis, drug induced liver injury and alcohol induced liver injury were suspected to be a case of autoimmune hepatitis. Recent IAIHG criteria was followed in making diagnosis of autoimmune hepatitis. We did the investigation for viral hepatitis (acute/chronic), drug induced liver injury and alcohol induced liver injury and then measured serum IgG. Indirect Immunofluorescence (IIF) was done for Anti-nuclear antibody and was also done for anti-smooth muscle antibody and anti-liver kidney microsomes-1 antibody simultaneously.

Result: As per IAIHG criteria, out of 250 patients, Ig "G" was elevated in 88 patients with significant titres for Anti-nuclear antibody (50 patients), anti-smooth muscle antibody (65 patients), anti-liver kidney microsomes-1 antibody (7 patients) and Anti-mitochondrial antibody (18 patients) were found. As per International Autoimmune Hepatitis Group Comprehensive scoring system, probable diagnosis was made in 83 patients (33.2%) and 12 were confirmed for autoimmune hepatitis (4.8%).

Conclusion: Female preponderance was observed and type 1 Autoimmune Hepatitis was most common whereas type 2 Autoimmune Hepatitis was found in few cases. Most patients had anti-smooth muscle antibody and anti-nuclear antibody positivity indicating the type, but no significant difference was seen in clinical symptoms or biochemical parameters between the different types. 162 patients couldn't be evaluated for autoimmune hepatitis because of serum IgG cut-off criteria >1500 ​mg/l.