322 Prenatal Glucocorticoids: Effects on Lung of Newborn Rats Exposed to Hypoxia and Recovered in Hyperoxia or Air.

Aims: To examine the morphometric changes produced on lung of neonatal rats treated with prenatal administration of betamethasone or dexamethasone, and test the hypothesis if glucocorticoids would produce any difference when pups are exposed to hypoxia and its recovery with oxygen or air ambient.