Diabetes Care, Vol 22, Issue 7 1053-1058, Copyright © 1999 by American Diabetes Association
Early postpartum metabolic assessment in women with prior gestational diabetes
F Pallardo, L Herranz, T Garcia-Ingelmo, C Grande, P Martin-Vaquero, M Janez and A Gonzalez
Department of Endocrinology, Hospital La Paz, Madrid, Spain.
OBJECTIVE: To present the results of early postpartum metabolic assessment
in women with gestational diabetes mellitus (GDM), to determine predictive
factors for subsequent diabetes, and to investigate the association of
postpartum glucose tolerance with other components of the metabolic
syndrome. RESEARCH DESIGN AND METHODS: A total of 788 women were evaluated
3-6 months after a GDM pregnancy. A 75-g oral glucose tolerance test (OGTT)
was performed. Cholesterol, HDL cholesterol, triglycerides, blood pressure,
BMI, and body fat distribution were assessed. Clinical and obstetric
history, baseline variables at the diagnosis of GDM, metabolic control
during pregnancy, and index pregnancy outcome were compared in women with
diabetes and women without diabetes (American Diabetes Association [ADA]
criteria) after pregnancy. Multivariate logistic regression analysis was
used to ascertain independent predictors of subsequent diabetes.
Correlation coefficients were assessed between postpartum glucose tolerance
and lipid levels, blood pressure, BMI, and body fat distribution. RESULTS:
According to ADA criteria, 588 (74.6%) women were normal, 46 (5.8%) had
impaired fasting glucose, 82 (10.4%) had impaired glucose tolerance, 29
(3.7%) had both impaired fasting glucose and impaired glucose tolerance,
and 43 (5.4%) had diabetes. Prepregnancy obesity, recurrence of GDM,
gestational age at diagnosis of GDM, glucose values in the 100-g OGTT,
number of abnormal values in the 100-g OGTT, fasting C-peptide levels in
pregnancy, C-peptide/glucose score in pregnancy, insulin requirement in
pregnancy, 3rd trimester HbA1c levels, and macrosomia differed
significantly in women with subsequent diabetes. Independent predictors of
postpartum diabetes were prepregnancy obesity, C-peptide/glucose score
during pregnancy, and the number of abnormal values in the 100-g diagnostic
OGTT. The area under the postpartum glucose curve was positively associated
with BMI, waist circumference, waist-to-hip ratio, triglycerides, and
systolic and diastolic blood pressures. CONCLUSIONS: Low C-peptide/glucose
score during pregnancy together with prepregnancy obesity and severity of
GDM (number of abnormal values in the 100-g diagnostic OGTT) are
independent predictors of subsequent diabetes. Our data suggest that
regardless of obesity and severity of GDM, a beta-cell defect increases the
risk of postpartum diabetes. The association of postpartum glucose
tolerance with triglyceride levels, blood pressure, obesity, and regional
distribution of body fat suggests that postpartum glucose intolerance
anticipates a high-risk cardiovascular profile that comprises other risk
factors besides diabetes.