HypocapniaHyperventilationCarbon DioxideAlkalosis, RespiratoryHypercapniaPartial PressureCerebrovascular CirculationIntracranial PressureApneaNitrous OxideRespirationHypotension, ControlledBlood Gas AnalysisOxygenAcid-Base EquilibriumHyperoxiaPulmonary VentilationBlood Flow VelocityAnoxiaHydrochloric AcidDogsTidal VolumeAltitudeIsofluraneAcidosis, RespiratoryTrimethaphanNeurocirculatory AstheniaCerebral ArteriesAcidosisCerebrospinal FluidBlood VolumeBlood PressureMiddle Cerebral ArteryRespiratory MechanicsBicarbonatesAnesthesia, InhalationUltrasonography, Doppler, TranscranialChemoreceptor CellsRespiration, ArtificialCarotid BodyRespiratory Dead SpaceHalothaneAirway ResistanceElectrolytesPia MaterEpidural SpaceVentilation-Perfusion RatioBrain