Liver cirrhosis and thyroid function: Friend or foe?

Area of Science:

• Endocrinology
• Hepatology
• Internal Medicine

Background:

• The liver is crucial for thyroid hormone metabolism, transport, and clearance.
• Thyroid and liver health are interdependent for maintaining hormonal balance.
• Limited data exists on thyroid function in liver cirrhosis patients.

Purpose of the Study:

• To assess thyroid hormone levels in stable liver cirrhosis patients.
• To compare thyroid function between cirrhosis patients and healthy controls.
• To investigate correlations between liver function tests and thyroid parameters, including autoimmunity.

Main Methods:

• Prospective case-control study involving 29 cirrhosis patients and 50 healthy controls.
• Exclusion of participants with confounding factors affecting thyroid function.
• Measurement of serum TSH, fT3, fT4, and TPO-Ab, with correlation analysis against liver function tests (AST, ALT, AP, GGT, INR, bilirubin, albumin) and Child-Pugh score.

Main Results:

• Significantly lower fT3 and fT4 levels were observed in cirrhosis patients compared to controls (p=0.001 and 0.002).
• No significant difference in TSH levels between the groups.
• No increased prevalence of thyroid autoimmunity (TPO-Ab) in cirrhosis patients.
• Negative correlation between fT3 levels and Child-Pugh score.

Conclusions:

• Cirrhosis patients exhibit reduced fT3 and fT4 levels with normal TSH, potentially indicating acquired central hypothyroidism consistent with non-thyroidal illness syndrome (NTIS).
• fT3 levels correlate negatively with liver dysfunction severity (Child-Pugh score).
• Thyroid autoimmunity is not more prevalent in this cohort of cirrhosis patients.