Depending on this study’s resources (finances and manpower), some nonselected patients underwent a frequent sampling OGTT (fsOGTT) with determination of glucose, insulin and C-peptide at minutes 0, 30, 60, 90 and 120, rather than determination of 2HPG alone. Of all study patients, an fsOGTT was performed in 26 patients at baseline (14 vildagliptin and 12 placebo), 31 patients at month 3 (15 vildagliptin and 16 placebo) and 28 patients at month 4 (15 vildagliptin and 13 placebo group). Insulin sensitivity in the fasting state was calculated by the quantitative insulin sensitivity check index (QUICKI), and in dynamic conditions (postprandial), by the fsOGTT-derived oral glucose insulin sensitivity index (OGIS), a figure of glucose clearance widely validated versus the glucose clamp, as well as by the Matsuda’s composite insulin sensitivity index (ISIcomp). For insulin secretion, indices of beta cell function (insulinogenic index and disposition index) and hepatic insulin extraction were assessed from fsOGTTs. All the above metabolic parameters have been fully described in Pacini and Mari (43). Areas under the curve (AUCs) for glucose, insulin and C-peptide were calculated from fsOGTTs using the trapezoidal rule.
Depending on this study’s resources (finances and manpower), some nonselected patients underwent a frequent sampling OGTT (fsOGTT) with determination of glucose, insulin and C-peptide at minutes 0, 30, 60, 90 and 120, rather than determination of 2HPG alone. Of all study patients, an fsOGTT was performed in 26 patients at baseline (14 vildagliptin and 12 placebo), 31 patients at month 3 (15 vildagliptin and 16 placebo) and 28 patients at month 4 (15 vildagliptin and 13 placebo group). Insulin sensitivity in the fasting state was calculated by the quantitative insulin sensitivity check index (QUICKI), and in dynamic conditions (postprandial), by the fsOGTT-derived oral glucose insulin sensitivity index (OGIS), a figure of glucose clearance widely validated versus the glucose clamp, as well as by the Matsuda’s composite insulin sensitivity index (ISIcomp). For insulin secretion, indices of beta cell function (insulinogenic index and disposition index) and hepatic insulin extraction were assessed from fsOGTTs. All the above metabolic parameters have been fully described in Pacini and Mari (43). Areas under the curve (AUCs) for glucose, insulin and C-peptide were calculated from fsOGTTs using the trapezoidal rule.
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