The perinatal events in 184 term control pregnancies and 129 prolonged pregnancies were prospectively compared. Fetal surveillance consisted of weekly biophysical profile testing. Thirty-two infants were dysmature, and 10 of these had advanced dysmaturity. The incidence of advanced dysmaturity rose quickly after 44 weeks. This group was at greater risk for fetal distress, lower Apgar scores, and emergency cesarean section. The combination of oligohydramnios, a suboptimal nonstress test, and a low profile score was highly predictive of a neonate with advanced dysmaturity. In the control pregnancies, the rate of induction of labor was 13.81% compared with 39.84% in the prolonged pregnancies. The induced labor group had a 51.32% cesarean section rate. Our approach to prolonged pregnancy consists of elective induction of labor when the cervix is favorable and biweekly profile testing when it is not; however, the high incidence of advanced dysmaturity after 44 weeks warrants delivery.
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