Abstract
The more rapid onset of action and the shorter half-life of repaglinide may reduce the post-load glucose excursion and limit sustained insulin secretion compared to sulphonylurea (SU) derivatives. We studied 12 patients with type 2 diabetes (age 62 +/- 2 years, BMI 28.3 +/- 1.3 kg m(-2), HbA1c 6.7 +/- 0.2%) on SU monotherapy at submaximal dose. Patients were treated for 3 weeks with repaglinide or glibenclamide in a randomized, crossover trial. At the end of each treatment period, patients underwent a 60-min hyperglycaemic clamp (glucose 12 mmol L(-1)) followed by 4-h observation (60-300 min) with frequent blood sampling for determination of glucose, insulin, proinsulin and C-peptide levels. Before the clamp (5 min for repaglinide, 30 min for glibenclamide), patients ingested their usual morning drug dose. After the end of the hyperglycaemic clamp, mean plasma glucose fell to a level of 5 mmol L(-1) after approximately 150 min with repaglinide, and after approximately 190 min with glibenclamide. While initially quite similar, in the period from 240 to 300 min, insulin, proinsulin and C-peptide levels were lower during repaglinide treatment (insulin 133 +/- 20 vs 153 +/- 25 pmol L(-1) (P < 0.05), proinsulin 14 +/- 3 vs 19 +/- 4 ...Continue Reading
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