Carotid SinusSyncopeSyncope, VasovagalCarotid ArteriesPressoreceptorsCarotid StenosisCarotid Artery DiseasesCarotid BodyEndarterectomy, CarotidCarotid Artery, InternalMassageChemoreceptor CellsCarotid Artery, CommonCranial SinusesMaxillary SinusSinus of ValsalvaReflexCavernous SinusParanasal SinusesCarotid Artery, ExternalBlood PressureBradycardiaBaroreflexDenervationSick Sinus SyndromeDogsFrontal SinusParanasal Sinus DiseasesSphenoid SinusHeart RateTilt-Table TestVagus NerveVagotomyCoronary SinusElectrocardiographyPacemaker, ArtificialFludrocortisoneAutonomic DenervationCarotid Artery ThrombosisSinus Thrombosis, IntracranialGlossopharyngeal NerveCarotid Artery InjuriesSodium CyanideReflex, AbnormalCatsEthmoid SinusHeart MassageSympathetic Nervous SystemCarotid Body TumorProspective StudiesRespirationRecurrenceVascular ResistanceCarotid Intima-Media ThicknessDizzinessPostureNeurons, EfferentCardiac Pacing, ArtificialRetrospective StudiesTime FactorsUnconsciousnessSyndromeParanasal Sinus NeoplasmsSensitivity and SpecificityPhrenic NerveFollow-Up StudiesTreatment OutcomeAccidental FallsTunica IntimaEndarterectomyTunica MediaHemodynamicsHeart SoundsTachycardia, SinusChloraloseTomography, X-Ray ComputedRisk FactorsDelayed DiagnosisMidodrineAnesthesiaMaxillary Sinus NeoplasmsSympathectomyPredictive Value of TestsElectrocardiography, AmbulatoryCarotid Artery, Internal, DissectionNeckEarly DiagnosisPrenatal DiagnosisAutonomic Nervous SystemCarbon DioxideCerebral AngiographyCross CirculationVeratrineVasomotor SystemPilonidal SinusPressureHeart BlockAnoxiaSinus Arrest, CardiacElectric Stimulation