HyperventilationHypocapniaCarbon DioxideCerebral ArteriesCerebrovascular CirculationRespirationAlkalosis, RespiratoryCerebral InfarctionAsthma, Exercise-InducedTreatment OutcomePartial PressureMiddle Cerebral ArteryCerebral PalsyHypercapniaBrainOxygenBlood Gas AnalysisOutcome Assessment (Health Care)Respiratory MechanicsIntracranial PressureCerebral AngiographyInfarction, Middle Cerebral ArteryHypoventilationPanicPulmonary VentilationChemoreceptor CellsMalaria, CerebralOxygen ConsumptionTime FactorsBrain IschemiaRitodrineCerebral VeinsBlood Flow VelocityPanic DisorderPulmonary Gas ExchangeAnoxiaPregnancy OutcomeCerebral HemorrhageApneaTidal VolumeAcid-Base EquilibriumMouth ProtectorsAirway ResistanceBlood PressureAtropine DerivativesBlood Gas Monitoring, TranscutaneousPlethysmography, ImpedanceMethacholine CompoundsIntracranial HypertensionMagnetic Resonance ImagingRetrospective StudiesNystagmus, PhysiologicXenon RadioisotopesProspective StudiesAcidosisCold TemperatureForced Expiratory VolumeSpectroscopy, Near-InfraredRespiratory Physiological PhenomenaCapnographyRespiratory Function TestsChloraloseBronchial Provocation TestsTrimethaphanAlkalosisFollow-Up StudiesHeart Rate