Respiratory Distress Syndrome, AdultRespiratory Distress Syndrome, NewbornRespiration, ArtificialPulmonary SurfactantsPositive-Pressure RespirationAcute Lung InjurySyndromeBarotraumaLungTidal VolumeInfant, NewbornProne PositionHigh-Frequency VentilationPulmonary Gas ExchangeInfant, PrematureLung InjuryPulmonary Surfactant-Associated Protein BLung ComplianceBronchoalveolar Lavage FluidPulmonary AlveoliRespiratory Dead SpaceRespiratory MechanicsPulmonary EdemaExtracorporeal Membrane OxygenationBlood Gas AnalysisLung DiseasesAirway ResistanceRespiratory InsufficiencyFetal Organ MaturityVentilator-Induced Lung InjuryBiological ProductsVentilators, MechanicalAirway ObstructionOxygenInfant, Premature, DiseasesGestational AgeBronchopulmonary DysplasiaRespiratory AspirationIntensive Care UnitsFatty AlcoholsOxygenators, MembraneAPACHEMultiple Organ FailurePneumoniaAirway RemodelingHyaline Membrane DiseasePulmonary Surfactant-Associated Protein CPneumothoraxProspective StudiesSepsisCritical CarePulmonary Surfactant-Associated ProteinsAmniotic FluidTreatment OutcomePulmonary AtelectasisFatal OutcomeAdministration, InhalationPartial PressureIntensive CareLung Volume MeasurementsPulmonary Surfactant-Associated Protein AInfant, Newborn, DiseasesRadiography, ThoracicPregnancyExtravascular Lung WaterIntensive Care, NeonatalIntensive Care Units, NeonatalRespiratory Function TestsSurface TensionBetamethasoneIntubation, IntratrachealPulmonary CirculationAcute DiseaseAdrenal Cortex HormonesCritical IllnessRetrospective StudiesRespiratory MucosaOxygen Inhalation TherapyRespiratory SystemSmoke Inhalation InjuryBronchiAir PressurePneumonia, AspirationProteolipidsTuberculosis, MiliaryContinuous Positive Airway PressureTime FactorsRisk FactorsPulmonary VentilationIntubationInfant, Very Low Birth WeightDisease Models, AnimalSeverity of Illness IndexRespiratory TherapyBronchoalveolar LavageNeuromuscular Blocking AgentsEmbolism, FatVentilator WeaningHemodynamicsInfant, Low Birth Weight