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J Pediatr. 2012 Jul;161(1):51-7. doi: 10.1016/j.jpeds.2011.12.050. Epub 2012 Feb 9.

Oral disposition index in obese youth from normal to prediabetes to diabetes: relationship to clamp disposition index.

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  • 1Division of Weight Management and Wellness, Children's Hospital of Pittsburgh, University of Pittsburgh Medical Center, Pittsburgh, PA 15224, USA.

Abstract

OBJECTIVE:

We sought to assess the glucose disposition index using an oral glucose tolerance test (OGTT; oDI) compared with the glucose disposition index measured from the combination of the euglycemic-hyperinsulinemic and hyperglycemic clamps (cDI) in obese pediatric subjects spanning the range of glucose tolerance.

STUDY DESIGN:

Overweight/obese adolescents (n = 185) with varying glucose tolerance (87 normal, 54 impaired, 31 with type 2 diabetes, and 13 with type 1 diabetes) completed an OGTT and both a hyperinsulinemic-euglycemic and a hyperglycemic clamp study. Indices of insulin sensitivity and β-cell function were calculated, and 4 different oDI estimates were calculated as the products of insulin and C-peptide-based sensitivity and secretion indices.

RESULTS:

Mirroring the differences across groups by cDI, the oDI estimates were greatest in normal glucose tolerance adolescents and lowest in type 2 diabetes mellitus and obese with type 1 diabetes mellitus adolescents. The insulin-based oDI estimates correlated with cDI overall (r ≥ 0.74, P < .001) and within each glucose tolerance group (r ≥ 0.40, P < .001). Also, oDI and cDI predicted 2-hour OGTT glucose similarly.

CONCLUSIONS:

The oDI is a simple surrogate estimate of β-cell function relative to insulin sensitivity that can be applied to obese adolescents with varying glucose tolerance in large-scale epidemiological studies where the applicability of clamp studies is limited due to feasibility, cost, and labor intensiveness.

Copyright © 2012 Mosby, Inc. All rights reserved.

PMID:
22325254
[PubMed - indexed for MEDLINE]
PMCID:
PMC3366166
Free PMC Article
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