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Response to dexamethasone in ventilated preterm infants: effect of radiographic subtype of chronic lung disease
J M Kothadia1, T M O'Shea, S T Auringer
1Department of Pediatrics, Bowman Gray School of Medicine, Wake Forest University, Winston-Salem, North Carolina 27157, USA.
Insights
Prolonged dexamethasone treatment reduced ventilator days in preterm infants with homogenous opacity. However, this benefit was not observed in infants with cystic changes and hyperinflation, suggesting treatment response varies by radiographic presentation.
Area of Science:
- Neonatal Medicine
- Pediatric Pulmonology
- Pharmacology
Background:
- Corticosteroids like dexamethasone are used to manage respiratory distress in preterm infants.
- The efficacy of prolonged dexamethasone treatment may depend on the specific radiographic lung pathology.
- Understanding differential treatment responses is crucial for optimizing care in ventilated neonates.
Purpose of the Study:
- To compare the effectiveness of prolonged dexamethasone treatment on ventilator weaning in two distinct groups of preterm infants.
- To investigate whether radiographic lung characteristics (homogenous opacity vs. cystic changes/hyperinflation) influence dexamethasone's impact on ventilation duration.
Main Methods:
- A cohort study comparing 49 preterm infants treated with 42-day dexamethasone to 49 matched controls.
- Infants had birthweights of 500-1250g, received treatment between 15-27 days old, and had no sepsis or PDA.
- Radiographs were reviewed to categorize infants into homogenous opacity or cystic changes/hyperinflation groups.
Main Results:
- In infants with homogenous opacity, dexamethasone significantly reduced days on assisted ventilation (7 vs. 23 days, p=0.001).
- In infants with cystic changes and hyperinflation, no significant difference in ventilation days was observed between dexamethasone and control groups (17 vs. 32 days, p=0.9).
- The beneficial effect of dexamethasone on reducing ventilation duration was attenuated in infants with cystic changes and hyperinflation.
Conclusions:
- Prolonged dexamethasone treatment is effective in reducing ventilator support duration for preterm infants with homogenous lung opacity.
- The radiographic pattern of cystic changes and hyperinflation may indicate a reduced response to prolonged dexamethasone therapy.
- Tailoring dexamethasone treatment based on radiographic lung findings could optimize outcomes for ventilated preterm infants.
Abstract:
We compared the response to prolonged treatment with dexamethasone in two groups of ventilated preterm infants: one whose chest radiographs showed homogenous opacity, and one whose radiographs showed cystic changes and hyperinflation. Forty-nine infants were treated with dexamethasone for 42 days, beginning when they were 15 to 27 days old, had no evidence of sepsis or patent ductus arteriosus, and had experienced no decrease in ventilator support for 24 hours. Forty-nine controls were selected who met these criteria for dexamethasone treatment. All had birthweights of 500 to 1250 g. Two radiographs made between 14 and 28 days of age were reviewed. Among infants with homogeneous opacity (19 dexamethasone, 26 controls), dexamethasone was associated with fewer days on assisted ventilation (median [interquartile range]: 7 [3-11] versus 23 [9-40]; p = 0.001). Among those with cystic changes and hyperexpansion (30 dexamethasone, 23 controls), no difference was found between dexamethasone treated infants and controls (17 [7-34] versus 32 [16-47]; p = 0.9). Thus, the effect of dexamethasone on days of ventilation was attenuated in infants with cystic changes and hyperinflation.
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