| Effect of dexamethasone on oral glucose tolerance in healthy adults. | |
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MedLine Citation:
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PMID: 20350917 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Objective: To determine the dose-response and time course of action of a single dose of dexamethasone on plasma glucose and insulin dynamics in healthy adults.Methods: Participants included healthy adults who met the following inclusion criteria: 18 to 65 years of age, body mass index of 18 to 25 kg/m2, no family history of diabetes mellitus, not taking any medication known to affect glucose tolerance, and nonpregnant state for female participants. Each participant underwent 3 sequential blocks of 75-g oral glucose tolerance tests (OGTTs) on days 1, 2, and 3; this sequence was repeated on 3 different occasions separated by more than 2 weeks. On the first day of each block, participants reported to the research center after a 10- to 12-hour overnight fast, and fasting baseline blood samples for glucose, insulin, and C-peptide were obtained. Baseline (0 mg) OGTT was then performed with a 75-g glucose load, and blood samples were collected at 30, 60, 90, and 120 minutes for measurements of glucose, insulin, and C-peptide. After the baseline OGTT on day 1, a single dose of either 2-, 4- or 8-mg of dexamethasone was administered orally. Twenty-four and 48 hours later, participants returned for additional OGTTs.Results: Ten healthy volunteers (4 male and 6 female) were enrolled. The effect of dexamethasone was maximal 24 hours after 8-mg dexamethasone compared with the effect observed after no dexamethasone administration. At 60 minutes during the OGTT (following 8-mg dexamethasone), blood glucose increased from 127 ± 7.1 mg/dL (6.35 ± 0.36 mmol/L) to 176 ± 19 mg/dL (8.8 ± 0.95 mmol/L), insulin increased from 49.3 ± 3.2 μIU/mL (342 ± 22 pmol/L) to 119.7 ± 10.1 μIU/mL (831 ± 70 pmol/L), and C-peptide increased from 6376 ± 510 pg/L (1913 ± 153 pmol/L) to 10 143 ± 1016 pg/L (3043 ± 305 pmol/L); the 60-minute levels returned towards baseline at 48 hours. Smaller changes were observed with 2- and 4-mg dexamethasone. Twenty-four hours after 8-mg dexamethasone, there was a 2.2- and 1.5-fold increase in homeostasis model assessment of insulin resistance and homeostasis model assessment of β cells, respectively, and a 2.5-fold decrease in the Matsuda sensitivity index.Conclusions: A single oral dose of 8-mg dexamethasone increases blood glucose, insulin, and C-peptide levels maximally at 24 hours, 1 hour following 75-g OGTT. A dexamethasone stress test might identify persons at increased risk for type 2 diabetes. |
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Authors:
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Dima Abdelmannan; Rundsara Tahboub; Saul Genuth; Faramarz Ismail-Beigi |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Endocrine practice : official journal of the American College of Endocrinology and the American Association of Clinical Endocrinologists Volume: 16 ISSN: 1934-2403 ISO Abbreviation: Endocr Pract Publication Date: 2010 Sep-Oct |
Date Detail:
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Created Date: 2011-03-01 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9607439 Medline TA: Endocr Pract Country: United States |
Other Details:
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Languages: eng Pagination: 770-7 Citation Subset: IM |
Affiliation:
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Department of Clinical and Molecular Endocrinology, Case Western Reserve University, Cleveland, Ohio Cleveland VA Medical Hospital, Cleveland, Ohio. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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