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Critical evaluation of the diagnosis of Gestational Diabetes Mellitus (GDM)

Critical evaluation of the diagnosis of Gestational Diabetes Mellitus (GDM). Simon Weitzman, MD, MPH. Critical evaluation of the diagnosis of Gestational Diabetes Mellitus (GDM). Diagnostic methods and criteria Screening strategies Maternal and offspring outcomes.

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Critical evaluation of the diagnosis of Gestational Diabetes Mellitus (GDM)

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  1. Critical evaluation of the diagnosis of Gestational Diabetes Mellitus (GDM) Simon Weitzman, MD, MPH

  2. Critical evaluation of the diagnosis of Gestational Diabetes Mellitus (GDM) Diagnostic methods and criteria Screening strategies Maternal and offspring outcomes

  3. Critical evaluation of the diagnosis of Gestational Diabetes Mellitus (GDM) Diagnostic methods and criteria Screening strategies Maternal and offspring outcomes

  4. Diagnostic Methods for GDM • 1-hr. Oral Glucose Challenge Test (GCT) • Oral Glucose Tolerance Test (OGTT) World Health Organization (WHO) National Diabetes Data Group (NDDG) Coustan Modification

  5. Diagnostic criteria for GDM Method Criteria (mg/dl) FPG 1 hr. 2 hr. 3 hr. WHO (75 gr) 140 - 200 - NDDG (100 gr) 105 190 165 145 Coustan (100 gr) 95 180 155 140 FPG: Fasting plasma glucose

  6. Critical evaluation of the diagnosis of Gestational Diabetes Mellitus (GDM) Diagnostic methods and criteria Screening strategies Maternal and offspring outcomes

  7. Screening strategies for GDM • The approach One-step approach Two-step approach

  8. Sensitivity: 38.2% Specificity: 93.3% Positive Predictive Value: 78.6 % Negative Predictive Value : 70.0 % The 50 gr. GCT (Cutoff >186 mg/dl)

  9. Sensitivity: 38.2% Specificity: 93.3% Positive Predictive Value:19.5% Negative Predictive Value: 97.2% The 50 gr. GCT (Cutoff >186mg/dl)

  10. Screening strategies for GDM • The population • Universal screening • High risk groups screening

  11. Universal versus high risk strategy Universal screening • 57.4% agreed to screening • 27.7 % GCT positive have abnormal OGTT • Non-participants have more risk factors • High Risk Group Screening • Would miss > 40% of GDM

  12. Universal screening in the Negev • 70 % of Jewish and 57% of Bedouins agreed to screening • GCT only in 49% of women • OGTT only in 10% • Overall non- participation: 40%

  13. Critical evaluation of the diagnosis of Gestational Diabetes Mellitus (GDM) Diagnostic methods and criteria Screening strategies Maternal and offspring outcomes

  14. Influence of GDM on the later development of diabetes in the child • Hyperglycemia affects fetal beta-cell function in animals • Intrauterine nutritional deprivation and maternal hyperglycemia increase the risk of diabetes in later life

  15. Maternal and offspring outcomes Characteristic Normal OGTT GDM LGA (%) 34 38 Gestational age (w) 39 39.2 Hospital days 3.7 3.9

  16. Perinatal characteristics of women with GDM, according to risk factors Characteristic Risk Factors OR(95%CI) Yes No Cesarean section (%) 38 35 1.6 (0.7-3.7) Macrosomia (%) 33 17 2.4 (0.9-6.7) Shoulder Dystocia (%) 7 13 0.5 (0.1-2.1) Insulin therapy (%) 30 28 1.1 (0.4-2.7)

  17. Plasma glucose levels in non obese, and obese women with previous GDM, after 5-10 years of follow-up

  18. Plasma insulin levels in non obese and obese women with previous GDM, after 5-10 years of follow-up

  19. Logistic regression analysis of factors relatedto the development of diabetes in women with previous GDM

  20. Glucose tolerance at follow-up in women with previous GDM and healthy controls

  21. Conclusions • J. Nerup said that Type 1 diabetes is the nightmare of geneticists. Paraphrasing his statement, we can say that GDM is the nightmare of epidemiologists. There is controversy about its definition, the best diagnostic method, diagnostic criteria, and the population to be screened.

  22. Conclusions (2) • Despite this confusion, the management of the condition has greatly improved, and the perinatal outcomes of offspring's of GDM mothers are comparable to those of non-diabetic women, except for macrosomia.

  23. Conclusions(3) • There is an increasing body of evidence supporting the risk of developing diabetes mellitus (and particularly type 2 diabetes) among women with previous GDM • Among obese GDM women, even years after delivery, features of insulin resistance can be found

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