Blood Gas AnalysisCarbon DioxideOxygenAcid-Base ImbalanceGasesPartial PressureCapnographyPulmonary Gas ExchangeBlood Gas Monitoring, TranscutaneousMacrophages, AlveolarOximetryRespiratory Dead SpaceRespiratory InsufficiencyHepatopulmonary SyndromeRespirationPulmonary AlveoliRespiratory Function TestsHypoventilationVentilation-Perfusion RatioBlood Specimen CollectionMethemoglobinemiaAcid-Base EquilibriumOxygen ConsumptionHypercapniaAnoxiaOxyhemoglobinsRespiration, ArtificialOxygen Inhalation TherapyLung DiseasesHydrogen-Ion ConcentrationAnesthesia, GeneralLungPulmonary EmbolismRadiography, ThoracicPositive-Pressure RespirationExercise TestPulmonary Disease, Chronic ObstructiveSpirometryAlveolar ProcessHemodynamicsProspective StudiesBicarbonatesVital CapacityArteriesForced Expiratory VolumePulmonary Alveolar ProteinosisAcute DiseaseHeart RateTime FactorsObesity Hypoventilation SyndromeSyringesSwineBlood PressureAlveolar Bone LossRhabdomyosarcoma, AlveolarLung Diseases, ObstructiveRetrospective StudiesPulmonary VentilationDisease Models, AnimalChromatography, GasPoint-of-Care SystemsTreatment OutcomeNoble GasesRespiratory Distress Syndrome, AdultGas Chromatography-Mass SpectrometryPredictive Value of TestsCardiac OutputExercise ToleranceMonitoring, PhysiologicIntensive CareBreath TestsBronchoalveolar Lavage FluidPulmonary SurfactantsDyspneaPulmonary EdemaPneumocytesLactic AcidTidal VolumeRespiratory MechanicsGas Poisoning