Consequences of nonindicated preterm delivery in singleton gestations.

OBJECTIVE: To determine the neonatal and economic consequences of nonindicated preterm delivery in singleton gestations. STUDY DESIGN: From a database of women with high-risk pregnancies enrolled for outpatient nursing services between October 1995 and February 2000, singleton gestations with induced labor or scheduled cesarean delivery and a gestational age at delivery of 34-36 weeks were identified. Excluded were women with preterm premature rupture of the membranes or medically indicated delivery. We compared infant neonatal intensive care unit (NICU) admission rates and ventilator use for consecutive weeks and applied a cost model to determine potential savings of delaying delivery. RESULTS: A total of 1,538 pregnancies were analyzed. Risk of NICU admission declined significantly with each advancing week (by >50%, P<.05). NICU length of stay and total nursery costs decreased significantly between weeks 35 and 36 and weeks 34 and 35. Need for ventilatory assistance increased significantly for infants admitted to the NICU between weeks 34 and 35. The incidence of respiratory distress syndrome decreased 49% between 35 and 36 weeks. CONCLUSION: Prolonging gestation 1 week beyond weeks 34 and 35 has a significant impact on improving neonatal outcome and decreasing associated costs. These factors should be considered when electing to deliver at 34 and 35 weeks.