HyperoxiaOxygenPulmonary AlveoliHyperbaric OxygenationLungAnoxiaAnimals, NewbornPartial PressureCarotid BodyTime FactorsChemoreceptor CellsRetinal VesselsIon-Selective ElectrodesLung InjuryBronchopulmonary DysplasiaProspective StudiesOxygen ConsumptionTreatment OutcomeRats, Sprague-DawleyCarbon DioxideRetinopathy of PrematurityBlood Gas AnalysisPneumocytesFollow-Up StudiesMicroscopy, Electrochemical, ScanningOxygen Inhalation TherapyHypercapniaRespiratory MechanicsRespirationDouble-Blind MethodAirOxidative StressBlood PressureDisease Models, AnimalPulmonary VentilationRisk FactorsPulmonary Surfactant-Associated Protein C