Pre-gestational versus gestational diabetes: a population based study on clinical and demographic differences

Area of Science:

• Obstetrics and Gynecology
• Endocrinology
• Public Health

Background:

• Gestational diabetes mellitus (GDM) and pre-gestational diabetes mellitus (PGDM) are distinct conditions affecting pregnant individuals.
• Understanding their differences is crucial for appropriate clinical management and patient counseling.

Purpose of the Study:

• To compare the clinical and demographic characteristics of patients with PGDM versus GDM.
• To identify specific risk factors and complications associated with each type of diabetes in pregnancy.

Main Methods:

• Analysis of the 2001-2007 California Health Discharge Database.
• Inclusion of 22,331 PGDM cases and 147,097 GDM cases identified via ICD-9-CM codes.
• Logistic regression analysis to adjust for confounders, examining demographics, pre-existing conditions, and antepartum/intrapartum complications.

Main Results:

• Both PGDM and GDM incidence increased over the study period, with advancing age a common risk factor.
• Racial prevalence differed: Asians had highest GDM, but lowest PGDM, alongside Caucasians.
• PGDM was associated with higher rates of chronic hypertension, renal disease, thyroid dysfunction, fetal malformations, fetal demise, pyelonephritis, eclampsia, shoulder dystocia, failed labor induction, and cesarean delivery.

Conclusions:

• Significant clinical morbidities and demographic disparities exist between PGDM and GDM patients.
• PGDM is associated with substantially higher maternal and fetal morbidity compared to GDM.
• Racial predispositions for GDM do not necessarily correlate with PGDM prevalence outside of pregnancy.