Abstract
Eleven patients with noninsulin-dependent diabetes mellitus were studied before and after 6-10 weeks of glyburide therapy. Patients were studied during a 24-h period on a mixed diet comprising 30 Cal/kg divided into three meals. The following day a hyperglycemic clamp study was performed, with glucose levels clamped at 300 mg/dL (16.7 mmol/L) for a 3-h period. Insulin secretion rates were calculated by deconvolution of peripheral C-peptide concentrations using individual C-peptide clearance kinetics derived after bolus injection of biosynthetic human C-peptide. After 6-10 weeks on glyburide, the identical studies were repeated. In response to glyburide, the fasting plasma glucose level decreased from 12.3 +/- 1.2 to 6.8 +/- 0.9 mmol/L. Although the mean glucose over the 24 h of the meal study decreased from 12.7 +/- 1.4 to 10.8 +/- 1.2 mmol/L, postprandial hyperglycemia persisted on therapy, and after breakfast, glucose levels exceeded 10 mmol/L and did not return to fasting levels for the remainder of the day. Fasting serum insulin, plasma C-peptide, and the insulin secretion rate were not different before (152 +/- 48 pmol/L, 0.82 +/- 0.16 pmol/mL, and 196 +/- 34 pmol/min, respectively) and after (186 +/- 28 pmol/L, 0.91 +/- 0...Continue Reading
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