The effect of antenatal dexamethasone administration on the fetal and neonatal ductus arteriosus. A randomized double-blind study
M. Eronen, A. Kari, E. Pesonen and M. Hallman
Children's Hospital, University of Helsinki, Finland.
OBJECTIVE--To determine whether antenatal dexamethasone sodium phosphate
administration constricts the fetal ductus arteriosus or improves
spontaneous closure of the ductus in premature infants. DESIGN--A
randomized double-blind study. SETTING--University hospital of Helsinki,
Finland. PARTICIPANTS--Sixty-one pregnant women with threatened preterm
delivery between 24 and 31.9 weeks' gestation and 57 of their offspring (28
in the dexamethasone and 29 in the placebo group), born at 24 to 34.9
weeks' gestation, were studied using Doppler echocardiography.
INTERVENTIONS--None. MEASUREMENTS AND MAIN RESULTS--Between the
dexamethasone and placebo groups, there were no significant differences in
systolic or diastolic flow velocity values in the fetal ductus arteriosus.
Of the 29 infants with respiratory distress syndrome, 26 (90%) had
hemodynamically significant patent ductus arteriosus and received
indomethacin sodium: 12 (92%) of 13 dexamethasone-treated infants and 14
(88%) of 16 placebo-treated infants. One placebo-treated infant was
ligated. Of the 28 infants without respiratory distress syndrome, only four
(14%) had hemodynamically significant patent ductus arteriosus. In infants
born at or before 30 weeks' gestation, spontaneous closure of the ductus
occurred more frequently after administration of prenatal dexamethasone (in
six of 17 infants; 35%) than placebo (in none of 10 infants; P < .05).
CONCLUSIONS--Our data indicate that antenatal dexamethasone administration
had no constrictive effect on the ductus arteriosus of the fetus between 24
and 31 weeks' gestation. However, antenatal dexamethasone had a beneficial
effect on ductal closure in very premature infants.
