VasoconstrictionVentilationRespiration, ArtificialPulmonary VentilationHigh-Frequency VentilationTidal VolumeIntermittent Positive-Pressure VentilationPositive-Pressure RespirationRespirationHigh-Frequency Jet VentilationNoninvasive VentilationVasoconstrictor AgentsPulmonary CirculationVentilator WeaningAnoxiaRespiratory MechanicsPulmonary Gas ExchangeCarbon DioxideVentilators, MechanicalVascular ResistanceVentilation-Perfusion RatioRegional Blood FlowOxygenLungHypercapniaBlood PressureHemodynamicsBlood Gas AnalysisPartial PressureIntubation, IntratrachealPulmonary ArteryRespiratory Distress Syndrome, AdultArteriolesVasodilationNorepinephrineEndothelin-1Ventilator-Induced Lung InjuryShiveringWork of BreathingForearmPhenylephrineRenal CirculationSkin TemperatureBody Temperature RegulationDogsMesenteric ArteriesLung ComplianceTracheostomyHeart RateNitric OxideVasomotor SystemVasodilator AgentsSympathetic Nervous SystemAdrenergic alpha-AgonistsOne-Lung VentilationAir PressureMuscle, Smooth, VascularReceptors, EndothelinPerfusionAdrenergic alpha-1 Receptor AgonistsRats, Sprague-DawleyHeliumArteriesCardiac OutputDose-Response Relationship, DrugIntensive Care UnitsTime FactorsLaryngeal MasksEndothelinsVentilators, Negative-PressureAdrenergic alpha-AntagonistsOxygen ConsumptionRespiratory Distress Syndrome, NewbornMasksMaximal Voluntary VentilationReceptor, Endothelin ARespiratory Function TestsLung Volume MeasurementsNG-Nitroarginine Methyl EsterHyperventilationAnesthesiaAngiotensin IIReceptor, Endothelin B15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidIntensive CareAirway ResistancePlethysmographyApneaReceptors, Adrenergic, alphaProne PositionHeadache Disorders, PrimaryPulmonary AtelectasisSplanchnic CirculationRespiratory Dead SpaceTracheotomyPulmonary EdemaMethoxamineOxygen Inhalation TherapyAnesthesia, GeneralCoronary Vessels