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Survival and Morbidity of Extremely Premature Infants Based on Obstetric Assessment of Gestational Age

From the Departments of Pediatrics and Obstetrics and Gynecology, University of North Carolina School of Medicine, Chapel Hill, North Carolina

Abstract

To provide current clinical information for obstetric decision- making and perinatal management, we present early morbidity and mortality data for extremely premature infants based on obstetric assessment of gestational age. We reviewed the records of 141 live-born infants with birth weights of 1600 g or lower born at a university hospital level III neonatal intensive care unit between January 1986 and April 1988, whose gestational ages estimated by antenatal obstetric evaluation were between 24-29 completed weeks. Neonatal survival to 30 days ranged from 20% at 24 weeks to 94% at 29 weeks. Chronic lung disease was present at 30 days in all infants born at 24 weeks' gestation, decreasing to 13% of infants born at 29 weeks' gestation. Rates of severe intraventricular hemorrhage (grade 3 or 4) ranged from 100% at 24 weeks to 7% at 29 weeks. These data represent a significant increase in survival and a decrease in early morbidity compared with those from similar populations before 1986.

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