Approximately one-quarter of mothers with diabetes failed induction of labor, and this failure was associated with a range of adverse outcomes for mothers and infants, based on data from more than 2,000 individuals.
Uncontrolled diabetes remains a risk factor for cesarean delivery, Ali Alhousseini, MD, of Corewell Health East, Dearborn, Michigan, and colleagues wrote in a study presented at the annual clinical and scientific meeting of the American College of Obstetricians and Gynecologists.
“Identifying and stratifying associated risk factors for failed induction of labor [IOL] may improve counseling and intrapartum care,” the researchers wrote in their abstract.
The researchers reviewed data from 2,172 mothers with diabetes who underwent IOL at a single university medical center between January 2013 and December 2021. They examined a range of maternal characteristics including age, ethnicity, gestational age, medical comorbidities, insulin administration, parity, and health insurance.
A total of 567 mothers with diabetes (26.1%) failed IOL and underwent cesarean delivery.
Overall, failed IOL was significantly associated with nulliparity (P = .0001), as well as preexisting diabetes compared with gestational diabetes, diabetes control with insulin, maternal essential hypertension, preeclampsia, and polyhydramnios (P = .001 for all). Other factors significantly associated with failed IOL included prenatal diagnosis of fetal growth restriction (P = .008), and placental abnormalities (P = .027).
Neonatal factors of weight, large for gestational age, head circumference, and height were not significantly associated with failed IOL (P > .05 for all).
As for neonatal outcomes, failed IOL was significantly associated with admission to neonatal intensive care unit, hyperbilirubinemia, and longer hospital stay (P = .001 for all). Failed IOL was significantly associated with lower 1-minute APGAR scores, but not with lower 5-minute APGAR scores, the researchers noted (P = .033 for 1-minute score). No association was noted between failed IOL and neonatal readmission, lower umbilical cord pH value, or maternal ethnicity.
The findings were limited by the retrospective design, but data analysis is ongoing, Dr. Alhousseini said. The researchers are continuing to assess the roles not only of optimal glucose control, but other maternal factors in improving maternal and neonatal outcomes, he said.
Data Add to Awareness of Risk Factors
The current study is important because of the increasing incidence of diabetes and the need to examine associated risk factors in pregnancy, Michael Richley, MD, a maternal fetal medicine physician at the University of Washington, Seattle, said in an interview. “The average age of onset of diabetes is becoming younger and type 2 diabetes in pregnancy is an increasingly common diagnosis,” said Dr. Richley, who was not involved in the study.
The increase in both maternal and neonatal adverse outcomes is expected given the risk factors identified in the study, said Dr. Richley. “The patients with diabetes also were sicker at baseline, with hypertensive disorders, growth restriction, and pregestational diabetes,” he noted.
The study findings support data from previous research, Dr. Richley said. The message to clinicians is that patients with diabetes not only have an increased risk of needing a cesarean delivery but also have an increased risk of poor outcomes if a cesarean delivery is needed, he said.
Although a prospective study would be useful to show causality as opposed to just an association, such a study is challenging in this patient population given the limitations of conducting research on labor and delivery, he said.
The study received no outside funding. The researchers and Dr. Richley had no financial conflicts to disclose.