Respiratory Distress Syndrome, AdultRespiratory Distress Syndrome, NewbornInfant, NewbornRespiration, ArtificialPulmonary SurfactantsAcute Lung InjuryPositive-Pressure RespirationSyndromeBarotraumaInfant, PrematureTidal VolumeProne PositionHigh-Frequency VentilationLungPulmonary Gas ExchangeLung InjuryPulmonary Surfactant-Associated Protein BPulmonary AlveoliInfant, Newborn, DiseasesLung ComplianceExtracorporeal Membrane OxygenationRespiratory Dead SpaceBronchoalveolar Lavage FluidGestational AgeInfant, Premature, DiseasesPulmonary EdemaBlood Gas AnalysisAnimals, NewbornRespiratory MechanicsFetal Organ MaturityRespiratory InsufficiencyLung DiseasesVentilator-Induced Lung InjuryBiological ProductsBronchopulmonary DysplasiaOxygenVentilators, MechanicalIntensive Care UnitsOxygenators, MembranePregnancyFatty AlcoholsRespiratory AspirationAPACHEMultiple Organ FailureHyaline Membrane DiseaseSepsisProspective StudiesPulmonary Surfactant-Associated Protein CIntensive Care Units, NeonatalPneumothoraxPneumoniaAmniotic FluidIntensive Care, NeonatalCritical CarePulmonary Surfactant-Associated ProteinsTreatment OutcomeFatal OutcomePartial PressureIntensive CarePulmonary AtelectasisPulmonary Surfactant-Associated Protein ARadiography, ThoracicExtravascular Lung WaterRetrospective StudiesBetamethasoneAdministration, InhalationInfant, Very Low Birth WeightCritical IllnessSurface TensionPulmonary CirculationLung Volume MeasurementsAcute DiseaseOxygen Inhalation TherapyInfant, Low Birth WeightAdrenal Cortex HormonesRisk FactorsTime FactorsProteolipidsSmoke Inhalation InjuryTuberculosis, MiliaryPneumonia, AspirationBirth WeightLeukomalacia, PeriventricularRespiratory Function TestsIntubationBronchoalveolar LavageSeverity of Illness IndexIntubation, IntratrachealHemodynamicsEmbolism, FatNeuromuscular Blocking AgentsVentilator WeaningCapnographyStress, PsychologicalRespiratory TherapyDisease Models, AnimalAir PressureInstillation, DrugPhosphatidylglycerolsDown Syndrome