Effects of inhalation of corticosteroids immediately after experimental chlorine gas lung injury

Background: To assess the effects of treatment with nebulized corticosteroi ds immediately after chlorine gas injury, Methods: Eighteen anesthetized and mechanically ventilated pigs were expose d to chlorine gas (140 ppm for 10 minutes) and observed for 6 hours. Nine p igs were treated with nebulized beclomethasone-dipropionate 20 mu g/kg (BDP group), and nine pigs were given no treatment (control group). Results: All animals developed severe pulmonary dysfunction, The initial de crease in Pao(2) was similar in both groups, but BDP-treated animals improv ed whereas control animals deteriorated (p < 0.005; analysis of variance). Pulmonary vascular resistance increased in both groups but less in the BDP group (p < 0.01). Lung-thorax compliance was better preserved in the BDP gr oup (p < 0.01), and oxygen delivery was significantly better in the BDP gro up (p < 0.01), One animal died in the BDP group, as did three animals in th e control group. Conclusion: Immediate treatment with nebulized BDP improved pulmonary and c ardiovascular function after experimental chlorine gas injury.