How Vitamin D Deficiency Affects Autoimmune Hepatitis: Symptoms, Risks, and Solutions

New research indicates that patients with autoimmune hepatitis and vitamin D deficiency may experience worse health outcomes. These outcomes include increased rates of hospitalization, intensive care unit admissions, acute hepatic failure, liver transplantation, and death.

The findings were shared at The Liver Meeting 2024, hosted by the American Association for the Study of Liver Diseases (AASLD) in San Diego, California. This research emphasizes the need for routine screening for vitamin D deficiency in patients with autoimmune hepatitis.

Previous studies have linked vitamin D to liver health, but the exact relationship remains unclear. Vitamin D deficiency might also contribute to the development of autoimmune diseases, raising questions about its potential effects on autoimmune hepatitis.

Mariana Nunes Ferreira, MD, an internal medicine resident, and her team highlighted that while vitamin D deficiency is known to worsen outcomes in chronic liver diseases, research on autoimmune hepatitis is limited.

The study utilized the TriNetX research network to examine outcomes in patients with autoimmune hepatitis based on their vitamin D levels. The researchers classified patients as having sufficient vitamin D (≥30 ng/mL), insufficient (20-29.9 ng/mL), or deficient (<20 ng/mL).

The primary focus was on all-cause mortality, while secondary outcomes included acute hepatic failure, liver transplantation, hospitalizations, and critical care admissions. Demographic factors and social determinants of health were accounted for in the analysis.

The study identified 1,186 patients with autoimmune hepatitis and vitamin D deficiency, matching them with 1,186 patients who had normal vitamin D levels. The results showed that patients with vitamin D deficiency had a significantly higher likelihood of experiencing several adverse outcomes compared to those with normal vitamin D levels:

• All-cause mortality: Adjusted odds ratio (aOR) of 3.66 (95% CI, 2.51-5.33)
• All-cause hospitalizations: aOR of 2.62 (95% CI, 2.13-3.22)
• Critical care unit admissions: aOR of 2.56 (95% CI, 1.86-3.52)
• Hepatic failure: aOR of 2.72 (95% CI, 2.10-3.52)
• Liver transplantation: aOR of 2.64 (95% CI, 1.27-5.49)

The investigators concluded that patients with autoimmune hepatitis might benefit from regular screening for vitamin D deficiency, following AASLD guidelines. They recommended treating individuals found to have vitamin D deficiency. More extensive prospective studies are needed to confirm these findings.