PEDIATRICS Vol. 97 No. 5 May 1996, pp. 644-648
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Antenatal Phenobarbital Therapy and Neonatal Outcome I: Effect on Intracranial Hemorrhage

Seetha Shankaran MD1, Eugene Cepeda MD1, Geraldine Muran RN1, Federico Mariona MD2, Samuel Johnson MD3, S. Nadya Kazzi MD4, Ronald Poland MD4, and Mary P. Bedard MD4

1 Department of Pediatrics, Wayne State University School of Medicine, Detroit
2 Department of Obstetrics, Wayne State University School of Medicine, Detroit
3 Department of Radiology, Hutzel Hospital, Wayne State University School of Medicine, Detroit
4 Department of Pediatrics, Hutzel Hospital, Wayne State University School of Medicine, Detroit

Objective. To evaluate the effect of antenatal phenobarbital (PB) therapy on neonatal intracranial hemorrhage (ICH) in preterm infants.

Design. Prospective, randomized, controlled trial.

Setting. Single institution study.

Subjects and Interventions. Women in preterm labor (<35 weeks' gestation) were assigned to control and treatment groups. The treatment group received 10 mg/kg (maximum, 1000 mg) PB intravenously, followed by 100 mg orally daily, until delivery. Neonates did not receive PB after birth. Head sonograms were performed on days 3, 7, and 14 and at discharge. Hemorrhage was classified as mild, moderate, or severe by a single reader.

Outcome Measures. Incidence of neonatal ICH in all infants, infants weighing less than 1250 g, and infants of multiple gestations.

Results. The study population comprised 110 women, 60 in the control group and 50 in the PB group. Neonates in the control group (n = 74, including 10 pairs of twins and 2 sets of triplets) were comparable to those in the treatment group (n = 62, including 7 pairs of twins, 1 set of triplets, and 1 set of quadruplets) regarding birth weight, gestational age, and other clinical risk factors for ICH. There was a trend for the incidence of any grade of hemorrhage to be lower in the PB group (22% [14 of 62]) compared with the control group (35% [26 of 74]). Moderate and severe hemorrhages were significantly lower in the PB group (1.6% [1 of 62]) compared with the control group (9.4% [7 of 74]). Among infants weighing less than 1250 g, overall ICH was lower in the PB group (23% [6 of 261) compared with the control group (51% [18 of 35]). Among multiple-gestation infants, overall ICH was 4.7% (1 of 21) in the PB group, compared with 31% (8 of 26) in the control group.

Conclusions. Antenatal PB therapy results in a significant decrease in moderate and severe ICH in infants born at less than 35 weeks' gestation. Antenatal PB therapy also resulted in a decrease in the incidence of all grades of ICH in infants weighing less than 1250 g and infants born of multiple gestations.

Submitted on March 21, 1995
Accepted on June 20, 1995




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