Heat-induced inhibition of erythrocyte sedimentation (HIES) was examined in 158 cases. HIES is significantly lower in patients with a liver cell damage isolated or due to metastases of a neoplastic process in comparison to that in patients suffering from inflammation or malign tumor not involving the liver. Generally, HIES depends upon the concentration of lysophosphatidyl choline (lysolecithin) which is set free in plasma by lecithin-cholesterol-acyltransferase (LCAT) during incubation. In patients with lever cell damage, LCAT is diminished. HIES is being influenced by several factors: Lysophosphatidyl choline is bound to albumin, and this prevents its reaction on the erythrocyte surface. Lysophospholipase reduces the concentration of lysophosphatidyl choline in the plasma by splitting off its fatty acid in the alpha-position. Specific serum proteins, the so-called agglomerines, which are responsible for the acceleration of erythrocyte sedimentation, are counteracting the HIES. The concentration of albumin and agglomerines in plasma and the activity of lysophospholipase are subject to physiologically and pathologically caused deviations. Thereby, HIES is being influenced individually at varying degrees. This makes it difficult to estimate the LCAT activity which represents the principal cause of HIES. As a consequence, HIES seems not to be suitable for clinical diagnostics.

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Introduction: Hypothyroidism is a common metabolic disorder in general population. Hypothyroidism is a commonly encountered health problem in Bangladesh and morbidity and mortality toll due to cardiovascular disease resulting from hypothyroidism is quite high. Hypothyroidism, dyslipidaemia and hyperhomocysteinemia are recognized risk factor for atherosclerosis and cardiovascular disease. Aim of the Study: The aim of this study was to evaluate the association between plasma Homocysteine level and atherogenic Index of plasma in patients with hypothyroidism. Methods: This was a case-control study and conducted in the Department of Biochemistry in cooperation with Department of Endocrinology, Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh during the period from January, 2012 to December, 2013. In our study, we included 60 newly diagnosed hypothyroid individuals as case and 60 euthyroid individuals as control. Result: In this study, most of the participants were female (62%) compared to male (38%) and we found the mean age of the case and control group was 34.31 ± 11.77 years and 32.42 ± 12.51 years. Mean serum homocysteine was found significantly higher in case group (19.00 ± 7.58 µmol/L) than control group (9.59 ± 1.91µmol/L).Mean AIP was found significantly higher in case (0.75 ± 0.27) than control (0.35 ± 0.20). We found 49 (81.67%) cases were within increased risk group of atherogenesis where as in control group it was 28 (46.67%).In present study, mild hyperhomocysteinemia was found in 80% cases and moderate hyperhomocysteinemia in 13.3% cases where as in control group it was 10% & 0% respectively. Conclusion: In this study, we found that total plasma homocysteine level was significantly increased in recently diagnosed hypothyroidism and was normal in control groups. We also found that hypothyroidism is associated with high atherogenic index and hyperhomocysteinemia which causes premature atherosclerosis.