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It has been hypothesized that the defects of insulin receptors may play an important role in the insulin resistance of coronary heart disease. As a test of this hypothesis, 20 male patients with myocardial infarction, 20 male patients with type 2 diabetes mellitus and 20 normal subjects as control were investigated.Plasma insulin were determined; at the meantinme, insulin receptors of erythrocyte were indentified by means of 125 I -labeled insulin binding to erythrocytes while the affinity constants (K1 ,K2) and the number of receptors with different affinity and capacity (Q1,Q2) were calculated according to Scatchard＇s graphic method. The results showed that the number of insulin receptors with low affinity (Q2) on erythrocytes,K1, K, were lower in patients with myocardial infarction than those in controls ; and Q2, K1 in patents with type 2 diabetes mellitus were also lower. So we concluded that the mechanism of insulin resistance in coronary heart disease might be associated with insulin receptor and affinity abnormalities ,differed from that in diabetic state with some degree of post-receptor defects, which suggests that there may be an interrelationship among insulin receptor defects, insulin resistance,hyperinsulinemia in developing coronary heart disease.
