Association between body mass index, lipid peroxidation and coronary lipid risk factors in hypothyroid subjects.

ABSTRACT

Background: Thyroid hormones plays an important role in control of metabolism in human. Hyperlipidaemia particularly hypercholesterolemia, is a well-documented significant health consequence associated with hypo-thyroidism. Oxidative stress is a common factor associated with several clinical conditions including hypothyroidism. Aims & Objective: To evaluate the association between BMI, Hyperlipidaemia, Lipid Peroxidation and Atherogenic risk in newly diagnosed hypothyroid patients. Material and Methods: 85 newly diagnosed hypothyroid cases and 41 euthyroid controls were studied for their Thyroid profile [TSH, T4 andT3], Lipid profile , Oxidative stress marker, Malondialdehyde {MDA} Lipid risk ratios, [TC/HDL-C and LDL-C / HDL-C ratio] , Atherogenic index [AIP] - log TG/HDL-C and Body Mass Index [BMI]. Results: Hypothyroid patients had hyperlipidaemia, especially hypercholesterolemia [224 ± 43.8 mg/dl], increased LDL-C level [150.4 ± 42.3 mg/dl] when compared to controls [169.5 ± 25.1 and 97 ± 25.5 respectively]. MDA was significantly increased [p< 0.0001] in hypothyroid subjects [6.14± 1.83μ mol/L] versus the controls [2.9 ± 0.86 μmol/L] .BMI had positive correlation with TSH [r =4.421; p<0.0001]. Conclusion: Hypothyroidism leads to hyperlipidaemia enhancing risk for cardiovascular diseases, the connecting link being oxidative stress. It was found that TSH had positive significant correlation with BMI, Lipid profile and oxidative stress in hypothyroid patients when compared to the controls making them more prone for coronary artery diseases.