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Glycemic variability in gestational diabetes mellitus and its association with β cell function
Jian-bin Su1, Xue-qin Wang, Jin-feng Chen
1Department of Endocrinology, The Second Affiliated Hospital of Nantong University, No. 6 North Hai-er-xiang Road, Nantong, 226001, China, sujbzjx@163.com.
Endocrine
|July 21, 2012
Summary
Gestational diabetes mellitus (GDM) increases maternal hyperglycemia, impacting pregnancy outcomes. Continuous glucose monitoring reveals higher glycemic variability in GDM, linked to impaired early insulin secretion.
Area of Science:
- Endocrinology
- Obstetrics
- Metabolic Disorders
Background:
- Maternal hyperglycemia in gestational diabetes mellitus (GDM) is linked to adverse pregnancy outcomes.
- Continuous glucose monitoring systems (CGMS) offer detailed insights into glucose fluctuations compared to intermittent measurements.
- Impaired beta-cell function contributes to hyperglycemia in GDM.
Purpose of the Study:
- To analyze glycemic variability characteristics in GDM during mid-pregnancy (24-28 weeks).
- To investigate the association between glycemic variability and beta-cell function in GDM.
- To compare glycemic variability and beta-cell function between GDM, normal pregnant women (NGW), and normal glucose regulation non-pregnant women (NGRW).
Main Methods:
- CGMS monitoring for 72 hours in 30 GDM, 20 NGW, and 20 NGRW.
- Assessed glycemic variability using Standard Deviation of Blood Glucose (SDBG), Mean of 24-h Blood Glucose (MBG), Mean Amplitude of Glycemic Excursions (MAGEs), and Mean of Daily Differences (MODDs).
- Evaluated beta-cell function using Homeostasis Model Assessment for Insulin Resistance (HOMA-IR), early insulinogenic index (ΔI30/ΔG30), and Area Under the Curve of Insulin (AUCI180).
Main Results:
- MAGE and MBG progressively increased from NGRW to NGW to GDM groups (p < 0.05).
- MODD and SDBG were significantly higher in the GDM group compared to controls (p < 0.05).
- Early insulin secretion (ΔI30/ΔG30) decreased, while insulin resistance (HOMA-IR) and second-phase insulin secretion (AUCI180) increased progressively from NGRW to GDM (p < 0.05).
- MAGE correlated negatively with ΔI30/ΔG30 (r = -0.78) and positively with HOMA-IR (r = 0.65) in the GDM group (p < 0.05).
- ΔI30/ΔG30 and HOMA-IR were independent factors influencing MAGE in GDM (β = -0.61, 0.34, respectively; p < 0.05).
Conclusions:
- Glycemic variability is significantly higher in GDM compared to normal pregnant women.
- Mean Amplitude of Glycemic Excursions (MAGE) is a key indicator of impaired early-phase insulin secretion in GDM.
- Further research is needed to develop treatment strategies targeting impaired insulin secretion and glycemic variability for improved pregnancy outcomes in GDM.
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