Sick Sinus SyndromeCarotid SinusSyncopePacemaker, ArtificialSyndromeCavernous SinusMaxillary SinusCarotid ArteriesPressoreceptorsCarotid StenosisParanasal Sinus DiseasesBradycardiaCardiac Pacing, ArtificialCranial SinusesCarotid Artery DiseasesCarotid BodyArrhythmia, SinusParanasal SinusesSinus of ValsalvaMassageElectrocardiographyEndarterectomy, CarotidCarotid Artery, InternalEnophthalmosHeart BlockFrontal SinusSphenoid SinusSyncope, VasovagalSinoatrial NodeTilt-Table TestChemoreceptor CellsCoronary SinusAutonomic DenervationCarotid Artery, CommonHeart RateAtrial FibrillationSinus Thrombosis, IntracranialReflexCarotid Artery, ExternalEthmoid SinusBlood PressureOphthalmoplegiaDizzinessDenervationNAV1.5 Voltage-Gated Sodium ChannelAtrial Function, RightDogsUnconsciousnessParanasal Sinus NeoplasmsHeart AtriaBaroreflexArrhythmias, CardiacElectrocardiography, AmbulatoryAtrioventricular BlockTachycardia, SinusAtrioventricular NodeHeart Conduction SystemTreatment OutcomeAzygos VeinVagotomyTelemetryFollow-Up StudiesVagus NerveMaxillary Sinus NeoplasmsProspective StudiesGlossopharyngeal NerveCarotid Artery ThrombosisPilonidal SinusSodium CyanideCarotid Artery InjuriesCatsTransverse SinusesMetabolic Syndrome XDown SyndromeRespirationCarotid Body TumorSuperior Sagittal SinusCarotid Intima-Media ThicknessHeart MassageSympathetic Nervous SystemNeurons, EfferentVascular ResistancePhrenic NerveRetrospective StudiesFludrocortisoneReflex, Abnormal