OxygenOximetryTransferrinFerritinsIronOxygen ConsumptionKineticsOxygen Inhalation TherapySpectroscopy, Near-InfraredOxyhemoglobinsAnoxiaReactive Oxygen SpeciesPartial PressureBlood Gas Monitoring, TranscutaneousBlood Gas AnalysisHemoglobinsAltitudeCarbon DioxideRespirationMonitoring, PhysiologicMonitoring, IntraoperativeJugular VeinsApneaHemodynamicsCyanosisSleep Apnea SyndromesCerebrovascular CirculationSinglet OxygenHeart RatePolysomnographyAltitude SicknessEisenmenger ComplexProspective StudiesInfant, NewbornConscious SedationMountaineeringPulmonary Gas ExchangeRetinal VeinTime Factors