Coronary SinusSinus of ValsalvaValsalva ManeuverCoronary VesselsCoronary AngiographyCoronary CirculationCranial SinusesMaxillary SinusParanasal SinusesCoronary Artery DiseaseCavernous SinusCarotid SinusFrontal SinusCoronary Vessel AnomaliesParanasal Sinus DiseasesSphenoid SinusAngioplasty, Balloon, CoronaryCoronary StenosisCoronary Artery BypassCardiac Pacing, ArtificialSinus Thrombosis, IntracranialElectrocardiographyCoronary DiseaseAortic AneurysmSick Sinus SyndromeEthmoid SinusCoronary AneurysmHeart AtriaCatheter AblationCardiac CatheterizationVena Cava, SuperiorParanasal Sinus NeoplasmsCoronary VasospasmPacemaker, ArtificialDogsHeart Conduction SystemTachycardia, SinusTreatment OutcomeAtrial FibrillationEchocardiography, TransesophagealAtrioventricular NodeMaxillary Sinus NeoplasmsMyocardial InfarctionCoronary ThrombosisTomography, X-Ray ComputedHeartHemodynamicsMyocardiumDilatation, PathologicSinoatrial NodeAtrial FlutterElectrophysiologic Techniques, CardiacTime FactorsHeart Arrest, InducedPilonidal SinusEchocardiographyFollow-Up StudiesTachycardia, Sinoatrial Nodal ReentryTransverse SinusesBundle of HisProspective StudiesBlood PressureMyocardial IschemiaCoronary RestenosisHeart RateFistulaAtrial FunctionSuperior Sagittal SinusElectrodes, ImplantedHeart VentriclesCoronary OcclusionVeinsBlood Flow VelocityCardiac Resynchronization Therapy DevicesPhlebographyTachycardia, SupraventricularRisk FactorsCardiac Surgical ProceduresTachycardia, Atrioventricular Nodal ReentryCardiac CathetersHeart Septal Defects, AtrialPercutaneous Coronary InterventionAtrial SeptumVascular FistulaProsthesis ImplantationPredictive Value of TestsHeart FailureBody Surface Potential MappingHeart SeptumTachycardiaAortic RuptureEchocardiography, Doppler, ColorReplantationCardiopulmonary BypassStentsWolff-Parkinson-White SyndromeHeart Septal DefectsTachycardia, ParoxysmalCoronary Care UnitsFluoroscopy