title: Acute effect of glyburide on insulin sensitivity in type I diabetic patients.
abstract: Possible extrapancreatic effects of glyburide on insulin action were studied in six patients with insulin-dependent diabetes mellitus. Each patient was studied on two separate occasions with continuous iv infusions of either glyburide (0.3 mg/h after a 1-mg iv bolus dose) or NaCl. During the studies blood glucose concentrations were controlled by a glucose-controlled infusion system (Biostator). The study included the 12-h period after the evening meal, followed by a 4-h period during which euglycemic hyperinsulinemic clamp studies were performed at two rates of insulin infusion: 1 and 10 mU/kg.min. During the glyburide infusion, the Biostator-determined insulin delivery rate was similar to that during the NaCl infusion for the first 6 h after the meal, but it decreased by 32% between the 6th and 12th hours after the meal. During the hyperinsulinemic clamp studies, glucose was delivered at a significantly higher rate when glyburide was infused; this was true for both rates of insulin infusion [5.6 +/- 1.9 (+/- SD) vs. 3.6 +/- 1.4 mg/kg.min and 12.1 +/- 2.4 vs. 9.1 +/- 2.1 mg/kg.min; P less than 0.05, glyburide vs. NaCl, respectively]. Plasma C-peptide was undetectable in all patients during both studies. These results indicate that 1) glyburide has an acute effect on insulin action in insulin-dependent diabetic patients; and 2) this effect occurs at physiological as well as pharmacological insulin concentrations.
mesh_terms: D001786:Blood Glucose / Q000032:analysis; D003922:Diabetes Mellitus, Type 1 / Q000097:blood / Q000188:drug therapy*; D004357:Drug Synergism; D005905:Glyburide / Q000627:therapeutic use*; D006801:Humans; D007328:Insulin / Q000627:therapeutic use*; D009994:Osmolar Concentration; D013997:Time Factors
chemical_list: D001786:Blood Glucose; D007328:Insulin; D005905:Glyburide