Longitudinal changes in pancreatic beta-cell function and metabolic clearance rate of insulin in pregnant women with normal and abnormal glucose tolerance

Diabetes Care
P M CatalanoS B Amini

Abstract

To evaluate basal pancreatic beta-cell secretion and suppression during infused insulin and the metabolic clearance rate of insulin in women with normal and abnormal glucose tolerance prior to conception and during pregnancy. Seven women with normal glucose tolerance and nine women with abnormal glucose tolerance during gestation were evaluated prior to conception, in early (12-14 weeks) and late (34-36 weeks) gestation. Basal insulin and C-peptide were measured after an 11-h fast and during the last 40 min of a 2-h hyperinsulinemic-euglycemic clamp at 40 mU.m-2.m-1. Suppression of basal C-peptide was calculated as the steady-state C-peptide/basal C-peptide. The metabolic clearance rate of insulin was calculated by dividing the insulin infusion rate by the steady-state insulin concentration, which was corrected for residual beta-cell secretion. No significant differences were noted in the following parameters between women with normal and abnormal glucose tolerance with advancing gestation: increase in basal insulin (P = 0.20) and C-peptide (P = 0.12), ability of infused insulin to decrease basal C-peptide concentration (P = 0.22), and metabolic clearance rate of insulin (P = 0.76). There was a significant 65% increase in both ...Continue Reading

Citations

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