Arrhythmia, SinusAtrial FlutterArrhythmias, CardiacElectrocardiographyButylscopolammonium BromideCatheter AblationHeart RateAtrial FibrillationVagus NerveRespirationAnti-Arrhythmia AgentsTricuspid ValveRespiratory RateRespiratory MechanicsAutonomic Nervous SystemHeart AtriaPropafenoneElectrophysiologic Techniques, CardiacHeart BlockHeart Conduction SystemElectric CountershockProcainamideCardiac Pacing, ArtificialPericarditisParasympathetic Nervous SystemTachycardia, SupraventricularBody Surface Potential MappingTachycardiaCoronary SinusFlecainideAtrial Function, RightPropanthelineCranial SinusesMaxillary SinusRespiratory Physiological PhenomenaDisopyramideSinoatrial NodeSick Sinus SyndromeAmiodaroneHeartParanasal SinusesCardiography, ImpedanceTidal VolumeAtrial FunctionVena Cava, InferiorSinus of ValsalvaAtrial Premature ComplexesCavernous SinusRefractory Period, ElectrophysiologicalGaggingTachycardia, Ectopic AtrialDogsTachycardia, ParoxysmalCarotid SinusElectrocardiography, AmbulatoryTachycardia, VentricularFrontal SinusElectrophysiologyParanasal Sinus DiseasesCryosurgeryPulmonary VeinsSphenoid SinusTreatment OutcomeAtrioventricular NodeFollow-Up StudiesHydrops FetalisRecurrenceGalvanic Skin ResponseSupine PositionConsciousnessSympathomimeticsFluoroscopyBaroreflexModels, CardiovascularAtropineSinus Thrombosis, IntracranialTilt-Table TestAtrial Function, LeftSotalolBlood PressureTime FactorsCardiovascular Physiological PhenomenaCardiac CathetersProspective StudiesTachycardia, Sinoatrial Nodal ReentryPacemaker, ArtificialBundle of HisEchocardiography, TransesophagealVentricular FibrillationFetal DiseasesHeart DiseasesEthmoid SinusCarbon DioxideTachycardia, SinusAutonomic Nervous System Diseases