The effect of severe trauma on urine loss of insulin

Six trauma patients and five healthy volunteers were given an intravenous glucose infusion (5 Gm. per hour) for 6 hours. The serum insulin response and urine insulin excretion were measured and compared in the two groups. Glucose intolerance and serum insulin levels which were elevated but inappropriately low for the degree of glycemia characterized the trauma patients. Urine insulin concentrations and total urine insulin were increased significantly in the trauma patients. Renal function was similar in both groups, as determined by serum creatinine, blood urea nitrogen, and creatinine clearance. The increase in urine insulin concentration in the trauma patients reflected the higher serum insulin concentrations, but no correlation existed between serum insulin and urine insulin concentrations. A negative correlation was found between "insulin clearance" and serum insulin in both groups, indicating altered renal handling of insulin following injury which may be a contributory factor to the relative hypoinsulinemia of trauma.