Respiratory Distress Syndrome, AdultRespiratory Distress Syndrome, NewbornRespiration, ArtificialInfant, NewbornPulmonary SurfactantsInfant, PrematureAcute Lung InjuryPositive-Pressure RespirationSyndromeBarotraumaTidal VolumeProne PositionHigh-Frequency VentilationLungPulmonary Gas ExchangeInfant, Premature, DiseasesLung InjuryPulmonary Surfactant-Associated Protein BLung CompliancePulmonary AlveoliRespiratory Dead SpaceBronchoalveolar Lavage FluidExtracorporeal Membrane OxygenationPulmonary EdemaGestational AgeBlood Gas AnalysisInfant, Newborn, DiseasesRespiratory MechanicsFetal Organ MaturityRespiratory InsufficiencyBronchopulmonary DysplasiaLung DiseasesVentilator-Induced Lung InjuryBiological ProductsOxygenVentilators, MechanicalIntensive Care UnitsOxygenators, MembraneRespiratory AspirationFatty AlcoholsAPACHEMultiple Organ FailureHyaline Membrane DiseaseProspective StudiesPregnancyInfant, Very Low Birth WeightPulmonary Surfactant-Associated Protein CPneumothoraxSepsisPneumoniaInfant, Low Birth WeightIntensive Care Units, NeonatalCritical CareTreatment OutcomeAmniotic FluidPulmonary Surfactant-Associated ProteinsIntensive Care, NeonatalFatal OutcomeInfant MortalityPartial PressureIntensive CarePulmonary AtelectasisInfant CarePulmonary Surfactant-Associated Protein ARadiography, ThoracicExtravascular Lung WaterInfant FoodBetamethasoneRetrospective StudiesAdministration, InhalationLung Volume MeasurementsSurface TensionAcute DiseaseCritical IllnessOxygen Inhalation TherapyPulmonary CirculationRisk FactorsAdrenal Cortex HormonesTuberculosis, MiliaryProteolipidsSmoke Inhalation InjuryPneumonia, AspirationTime FactorsBirth WeightLeukomalacia, PeriventricularRespiratory Function TestsIntubationBronchoalveolar LavageSeverity of Illness IndexInfant FormulaInfant BehaviorIntubation, IntratrachealEmbolism, FatVentilator WeaningStress, PsychologicalHemodynamicsNeuromuscular Blocking AgentsRespiratory TherapyAir PressureCapnography