The association between fasting serum insulin, apo-lipoproteins level, and severity of coronary artery involvement in non-diabetic patients

BACKGROUND: In the previous studies, fasting insulin and apo-lipoproteins are considered as one of the risk-factor of coronary artery disease (CAD) but did not have the same results. In this study, we attempted to define the association of high fasting insulin and apo-lipoproteins of serum in non-diabetic patients who were afflicted with coronary arteries disease with severity of coronary arteries involvement. MATERIALS AND METHODS: This study was conducted between September 2011 and February 2012 on three groups, each one consisting of 100 members while using angiographic scores of Gensini with three equal groups with low, medium, and high stenosis of coronary arteries. The evaluation of non-diabetic patients afflicted with CADs, included the fasting glucose level less than 126 mg/dl or non-consumption of blood glucose reduction drugs or negativity history of diabetes. RESULTS: In this study, there were 300 non-diabetic patients afflicted with CAD in three groups of low, medium, and high extremity. Due to attained results, the patients afflicted with high CAD had a higher level of insulin (18.3 ± 0.8) in relation with low and medium groups (P < 0.001). As it was observed, the level of serum apo-lipoproteins of A1 (APO-A1) in low group of CAD (175 ± 36.4) is meaningfully higher than its quantity in high-CAD group (158 ± 42.4, P < 0.001). Furthermore, the quantity of serum apo-lipoproteins of B (APO-B) in mild CAD group (139 ± 30.4) is meaningfully less than severe CAD group (155.21 ± 29.7, P < 0.001). CONCLUSION: Our findings show that insulin, APO-A1, APO-B, and total cholesterol measurement is a good case for defining the severity of coronary artery involvement, while high-density lipoprotein, low-density lipoprotein, and triglyceride are not important risk-factors.