ASSOCIATION BETWEEN GLYCATED HEMOGLOBIN AND ELEVATED THYROID HORMONES LEVELS IN PATIENTS WITH TYPE 2 DIABETES...

Area of Science:

• Endocrinology
• Metabolic Disorders
• Diabetes Research

Background:

• Hyperthyroidism is more prevalent in Type 2 Diabetes Mellitus (T2DM) patients.
• Elevated thyroid hormones in hyperthyroidism exacerbate glycemic control issues, including hyperglycemia and insulinopenia.
• Understanding the interplay between thyroid function and glycemic status in T2DM is crucial for patient management.

Purpose of the Study:

• To investigate the association between serum glycated hemoglobin (HbA1c) and thyroid hormone profiles (FT3, FT4, TSH) in T2DM patients.
• To identify potential biomarkers for predicting hyperthyroidism risk in individuals with T2DM.
• To explore the relationship between glycemic control, diabetes duration, and thyroid hormone levels.

Main Methods:

• A cross-sectional and case-control study involving 189 T2DM patients with varying glycemic control.
• Measurement of HbA1c, fasting blood glucose (FBG), TSH, FT3, and FT4 using spectrophotometric and electrochemiluminescent assays.
• Statistical analyses including Cox proportional hazard and support vector machine analyses to assess biomarker associations.

Main Results:

• Significant differences in FBG, HbA1c, TSH, FT3, and FT4 were observed between patients with good and poor glycemic status (P<0.05).
• A moderate negative correlation was found between TSH and FBG, HbA1c, and diabetes duration.
• Strong positive correlations were identified between FT3/FT4 and FBG, HbA1c, and diabetes duration, indicating poorer glycemic control and longer disease duration with elevated FT3/FT4.

Conclusions:

• Well-controlled T2DM is associated with a reduced risk of hyperthyroidism.
• Elevated HbA1c and suppressed TSH levels may serve as predictive biomarkers for hyperthyroidism in T2DM patients.
• Combined assessment of HbA1c and TSH can aid in identifying individuals at higher risk for developing hyperthyroidism.