PEDIATRICS Vol. 90 No. 4 October 1992, pp. 529-533
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Prolonged Dexamethasone Therapy Reduces the Incidence of Cryotherapy for Retinopathy of Prematurity in Infants of Less Than 1 Kilogram Birth Weight With Bronchopulmonary Dysplasia

Daniel B. Sobel MD1 and Alistair G.S. Philip MD, FRCP(E)1

1 From the Division of Neonatology, Department of Pediatrics, Maine Medical Center, Portland

To determine whether prolonged dexamethasone therapy, used in the treatment of bronchopulmonary dysplasia (BPD), affects the incidence of cryotheraphy for retinopathy of prematurity, the authors conducted a retrospective review of all infants admitted to a neonatal intensive care unit between October 1988 and October 1990 (n = 957) whose birth weights were less than 1 kg (n = 90). All admissions were reviewed to determine birth weight, gestational age, survival, incidence of BPD and cryotherapy, use and duration of dexamethasone therapy, length of mechanical ventilation, continuous positive airway pressure, and additional supplemental oxygen. Of all neonatal intensive care unit admissions, 9.4% weighed less than 1 kg, and 64% survived for greater than 28 days (n = 58). Of the survivors, 82% had BPD. Cryotherapy for retinopathy of prematurity was used only in those with birth weights of less than 1 kg and with BPD. All those treated with dexamethasone (n = 23) had BPD and significantly lower gestational ages (25.6 vs 26.4 weeks) (P= .05) and birth weights (759 vs 824 g) (P < .05) than those not treated (n = 25). Dexamethasone was used in 23 of 48 infants (9 for le24 days, 14 for >24 days). Eleven required cryotherapy: 5 of 25 with no dexamethasone, 5 of 9 treated for 24 days or less, and 1 of 14 treated for longer than 24 days (P < .04). In those treated with prolonged (>24 days) dexamethasone, cryotherapy was significantly reduced compared with those treated for shorter periods. Although the probability was significant, the 95% confidence intervals were wide. Controlled prospective trials are needed to determine optimal usage and side effects of dexamethasone in premature infants.

Key Words: cryotherapy • retinopathy of prematurity • newborns • bronchopulmonary dysplasia • dexamethasone

Submitted on January 13, 1992
Accepted on April 15, 1992




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