Respiratory Distress Syndrome, AdultFetal Organ MaturityRespiratory Distress Syndrome, NewbornAmniotic FluidLungPulmonary SurfactantsHyaline Membrane DiseaseInfant, NewbornRespiration, ArtificialSphingomyelinsAcute Lung InjuryPositive-Pressure RespirationSyndromeBarotraumaTidal VolumeGestational AgePrenatal DiagnosisProne PositionLung InjuryHigh-Frequency VentilationInfant, PrematurePulmonary Gas ExchangePregnancyPhosphatidylglycerolsAmniocentesisInfant, Newborn, DiseasesPhosphatidylcholinesLung DiseasesPulmonary Surfactant-Associated Protein BPulmonary AlveoliTerm BirthFluorescence PolarizationLung ComplianceBronchoalveolar Lavage FluidPulmonary EdemaRespiratory Dead SpacePregnancy in DiabeticsExtracorporeal Membrane OxygenationBlood Gas AnalysisRespiratory MechanicsVentilator-Induced Lung InjuryRespiratory InsufficiencyAnimals, NewbornBiological ProductsInfant, Premature, DiseasesOxygenPhospholipidsVentilators, MechanicalBronchopulmonary DysplasiaIntensive Care UnitsRespiratory AspirationOxygenators, MembraneFatty AlcoholsAPACHEMultiple Organ FailurePneumoniaPulmonary Surfactant-Associated Protein CPneumothoraxProspective StudiesSepsisPulmonary Surfactant-Associated ProteinsLung Volume MeasurementsTreatment OutcomeExtravascular Lung WaterChromatography, Thin LayerCritical CareFatal OutcomePulmonary AtelectasisPartial PressureRadiography, ThoracicIntensive CarePulmonary Surfactant-Associated Protein AIntensive Care Units, NeonatalIntensive Care, NeonatalPulmonary CirculationAdministration, InhalationRetrospective StudiesBetamethasoneLung NeoplasmsSurface TensionAcute DiseaseCritical IllnessRespiratory Function TestsOxygen Inhalation TherapyProteolipidsRisk FactorsAdrenal Cortex HormonesTime FactorsSmoke Inhalation InjuryTuberculosis, MiliaryBronchoalveolar LavagePneumonia, AspirationInfant, Very Low Birth WeightInfant, Low Birth WeightIntubationSeverity of Illness IndexHemodynamicsIntubation, IntratrachealBirth WeightEmbolism, Fat