Abstract
In 120 consecutive patients undergoing diagnostic coronary arteriography, fasting blood glucose, plasma insulin, glucagon, serum cholesterol and triglyceride concentrations were measured. The insulin-glucose ratio and insulin-glucagon ratio were calculated. Forty-five patients had normal coronary arteries, 19 had single vessel coronary artery disease and 56 patients had multiple vessel disease. Fasting blood glucose was greater than 120 mg/100 ml in 37 patients (group A) and included 9 of the 10 known diabetics, 3 of whom were being treated with insulin. Seventy-seven patients included in group B had fasting blood glucose concentration less than 120 mg/100 ml. Patients with multiple vessel coronary disease in either group had higher blood glucose and cholesterol concentrations than those with normal coronary arteries or the ones with single vessel disease, but they did not have higher plasma insulin or glucagon levels nor increased insulin-glucose or insulin-glucagon ratios. With comparable extent of coronary artery disease patients in group A had higher plasma insulin levels and insulin-glucagon ratios than those in group B, but no correlation exists between the presence or extent of coronary atherosclerosis and these variables in either group. Thus, neither fasting plasma insulin level nor insulin-glucagon ratio predicts the status of underlying coronary atherosclerosis in either diabetics or nondiabetics.
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