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Aim of the present study was to evaluate the pancreatic beta cell response to oral glucose load in a group of patients with hyperthyroidism. For this purpose plasma C-peptide at fasting and after a 100 g oral glucose load was measured in 8 newly-diagnosed untreated hyperthyroid patients with fasting normoglycemia, and 8 sex-, age-, and weight-matched healthy controls. As compared to healthy subjects, patients with hyperthyroidism showed higher plasma glucose levels (incremental area 5405 +/- 742 vs 2729 +/- 539 mg/dl x 180 min, p less than 0.05), and slightly reduced plasma C-peptide concentrations (incremental area 166 +/- 12 vs 182 +/- 36 pmol/ml x 180 min, p = NS) following oral glucose load. The ratios between plasma C-peptide and plasma glucose incremental areas were lower in hyperthyroid patients than in controls (3.66 +/- 0.85 vs 10.41 +/- 3.08, p less than 0.05). These data suggest that hyperthyroidism is characterized by a decreased pancreatic beta cell response to oral glucose load.
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