Autoimmune hepatitis in a North American Aboriginal/First Nations population

Area of Science:

• Immunology
• Hepatology
• Population Health

Background:

• North American Aboriginal populations exhibit a higher susceptibility to immune-mediated disorders.
• Autoimmune hepatitis (AIH) is a significant immune-mediated liver disease.

Purpose of the Study:

• To compare the demographic, clinical, biochemical, serological, radiological, and histological characteristics of autoimmune hepatitis between First Nations (FN) and predominantly Caucasian, non-FN patients.
• To investigate potential differences in the severity and presentation of AIH in FN populations.

Main Methods:

• Retrospective comparative study of 33 First Nations patients and 150 non-FN patients with autoimmune hepatitis.
• Analysis of demographic data, clinical presentation, laboratory values (serum albumin, bilirubin, hemoglobin, complement, immunoglobulin A), and liver histology.
• Assessment of radiological findings for evidence of advanced liver disease.

Main Results:

• First Nations patients were more frequently female (91% vs. 71%) and presented with lower serum albumin (69% vs. 36%) and higher bilirubin levels (57% vs. 35%).
• FN patients showed lower hemoglobin and complement levels, increased cholestasis, and higher immunoglobulin A levels.
• While FN patients exhibited higher histological inflammation, fibrosis, and more advanced liver disease on clinical and radiological assessment, these differences were not statistically significant.

Conclusions:

• Autoimmune hepatitis may be more common and present with greater severity in First Nations populations compared to Caucasian populations.
• Distinct clinical and biochemical profiles are observed in FN patients with AIH, suggesting unique disease characteristics.
• Further research is warranted to understand the underlying factors contributing to these observed disparities in AIH.