Nasal MucosaRespiratory MucosaRespiration, ArtificialAdenoidsMucous MembraneOlfactory MucosaVentilator WeaningMucociliary ClearanceRespiratory SystemMicroscopy, Electron, ScanningTidal VolumeBacterial AdhesionVentilators, MechanicalVentilationPositive-Pressure RespirationPulmonary VentilationHigh-Frequency VentilationRespiratory InsufficiencyAdministration, IntranasalIntubation, IntratrachealVentilator-Induced Lung InjuryTracheostomyHaemophilus influenzaeStress, MechanicalIntensive Care UnitsAirway ResistanceRespiratory MechanicsOrgan Culture TechniquesAirway ObstructionRespiratory Distress Syndrome, AdultIntermittent Positive-Pressure VentilationIntestinal MucosaNoninvasive VentilationIntensive CareGastric MucosaPulmonary Gas ExchangeLungAirway RemodelingCritical IllnessRespirationTracheotomyLung ComplianceCarbon DioxideWork of BreathingHigh-Frequency Jet VentilationAirway ExtubationPneumonia, Ventilator-AssociatedDiaphragmAir PressureBlood Gas AnalysisMouth MucosaCritical CareTime FactorsLung InjuryRespiratory Distress Syndrome, NewbornIntensive Care Units, PediatricAPACHEHypercapniaLung Volume MeasurementsRespiratory Function TestsOxygenAcute Lung InjuryPulmonary AtelectasisLength of StayBarotraumaProspective StudiesBronchiPartial PressureVentilation-Perfusion RatioTreatment OutcomeAirway ManagementPneumoniaRespiratory TherapyInfant, NewbornLung DiseasesLaryngeal MasksBronchoalveolar Lavage FluidRespiratory MusclesInhalationRetrospective StudiesHeliumPressureVentilators, Negative-PressureRespiratory Dead SpaceMasksRespiratory Physiological PhenomenaProne PositionLung Diseases, ObstructiveContinuous Positive Airway PressureApneaMechanical ProcessesHospital MortalityPulmonary AlveoliInteractive Ventilatory SupportOxygen Inhalation TherapyPulmonary EdemaAsthmaHypnotics and SedativesPulmonary SurfactantsMonitoring, Physiologic