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Sequential measurement of Pco2 and ventilatory pressure. (A) Endotracheal LPS caused an increase in Pco2 after 3 h of age. Pco2 was maintained in group treated with rhSP-D. (B) Ventilatory pressure (PIP-PEEP) used to maintain target tidal volume was similar for both groups. *p < 0.05 versus control.
