Pregnancy outcomes in very advanced maternal age women

Advanced maternal age is associated with adverse pregnancy and delivery outcomes. Few studies have directly compared outcomes between women of advanced maternal age (35-44 years old) and women of very advanced maternal age (≥45 years old).

We aimed to determine the differences in outcomes between women of advanced maternal age and women of very advanced maternal age.

This was a retrospective cohort study conducted at a large urban US medical center. Demographic and obstetrical data were collected in all patients who delivered within the study window (2012-2018). Characteristics and outcomes were compared between women of advanced maternal age and women of very advanced maternal age. Chi-square analyses were used to compare categorical variables. The Student t test or Wilcoxon tests were used, depending on the distribution, to compare continuous variables.

A total of 45,435 women had delivery data for analysis. Of these women, 26,700 (59%) were not of advanced maternal age, 18,286 (40%) were of advanced maternal age, and 449 (1%) were of very advanced maternal age. Race and ethnicity varied significantly by age group. Nulliparity and postpartum hemorrhage were statistically higher in the very advanced maternal age group. Of note, cesarean delivery rates were 69.5% in the very advanced maternal age group and 39.5% in the advanced maternal age group (P<.001). Chronic hypertension, gestational hypertension, preeclampsia with and without severe features, superimposed preeclampsia, and eclampsia were all statistically significantly higher (at least 2-fold) in the very advanced maternal age group than the advanced maternal age group (P<.001). There was no significant difference in the rates of hemolysis, elevated liver enzymes, and low platelet count between the 2 groups. Rates of neonatal intensive care unit admission, Apgar score of <7 at 5 minutes, and neonatal length of stay of >5 days after cesarean delivery were higher in neonates from mothers of very advanced maternal age. Birthweights of neonates were significantly lower in mothers of very advanced maternal age.

There were several important significant differences in the outcomes between women of very advanced maternal age women and women of advanced maternal age, especially concerning hypertensive disorders and cesarean delivery rates. These findings may influence patient counseling and strategies for antepartum surveillance.