Analysis of autoimmune hepatitis with acute presentation in the early stage of illness.

Background and Aim: There is no gold standard for making the diagnosis of autoimmune hepatitis (AIH), and the diagnosis of acute onset AIH (A‐AIH) is most challenging. A‐AIH sometimes develops into acute liver failure with poor prognosis if the diagnosis is delayed. Therefore, it is most important for the better prognosis to diagnose non‐severe A‐AIH early and treat appropriately. However, features in the early stage of A‐AIH are unclear. We examined initial characteristics of non‐severe A‐AIH in detail and tried to find novel clinical features for the early diagnosis. Methods: Clinical, biochemical, immunological, radiological, and histological features of 71 patients (54 women, mean age 57.9 ± 14.3 years) with non‐severe A‐AIH admitted to community hospitals between 2001 and 2022 were analyzed retrospectively. Result: Forty‐six had no symptom on onset and liver injuries were discovered by regular medical checkups. The mean duration from onset to consultation was 25.0 ± 29.3 days. Liver histology showed acute hepatitis in 59% and chronic hepatitis in 41%. Patients with symptoms revealed more male sex (P = 0.039), higher alanine aminotransferase (P < 0.001), higher total bilirubin (P < 0.001), and higher rate of histological acute hepatitis (P = 0.0013) than those without symptoms significantly. Male sex, presence of symptoms on onset, occurrence of jaundice in the course, and histological acute hepatitis were correlated. Conclusions: Sixty‐five percent of non‐severe A‐AIH patients were asymptomatic on onset, suggesting that A‐AIH would develop insidiously and present a longer clinical course than that reported. Male patients more often revealed true acute hepatitis clinically, biochemically, and histologically than female ones. [ABSTRACT FROM AUTHOR]