HypocapniaHypercapniaHyperventilationCarbon DioxideAlkalosis, RespiratoryPartial PressureCerebrovascular CirculationRespirationAnoxiaApneaOxygenIntracranial PressurePulmonary VentilationAcidosis, RespiratoryBlood Gas AnalysisChemoreceptor CellsAcid-Base EquilibriumHyperoxiaTidal VolumeNitrous OxideRespiratory MechanicsAcidosisHypotension, ControlledBlood Flow VelocityDogsCerebral ArteriesCarotid BodyAltitudePia MaterIsofluraneHydrochloric AcidBlood PressureBicarbonatesRespiration, ArtificialTrimethaphanMiddle Cerebral ArteryNeurocirculatory AstheniaUltrasonography, Doppler, TranscranialBlood VolumeHydrogen-Ion ConcentrationAirway ResistanceBrainCerebrospinal FluidRespiratory Dead SpaceAnesthesia, InhalationHeart RateHalothanePhrenic NerveVentilation-Perfusion RatioElectrolytesHomeostasisAnesthesiaEpidural SpaceSleep StagesOxygen Consumption