Coronary SinusCoronary CirculationCoronary VesselsHeart Arrest, InducedMyocardiumHemodynamicsCoronary AngiographyCranial SinusesDogsCardiac CatheterizationHeartCoronary DiseaseLactatesOxygen ConsumptionCoronary Artery DiseaseSinus of ValsalvaVascular ResistanceHeart RateOxygenAngioplasty, Balloon, CoronaryCoronary StenosisCoronary Artery BypassMaxillary SinusParanasal SinusesCardiac Pacing, ArtificialCavernous SinusCoronary Vessel AnomaliesElectrocardiographyCoronary AneurysmVena Cava, SuperiorCarotid SinusCoronary VasospasmHeart AtriaCatheter AblationFrontal SinusParanasal Sinus DiseasesSphenoid SinusAdenosinePacemaker, ArtificialHeart Conduction SystemMyocardial InfarctionTreatment OutcomeAtrial FibrillationCoronary ThrombosisAtrioventricular NodeBlood PressureLactic AcidElectrophysiologic Techniques, CardiacSinus Thrombosis, IntracranialSick Sinus SyndromeAtrial FlutterEthmoid SinusTachycardia, Sinoatrial Nodal ReentryCoronary RestenosisMyocardial IschemiaBundle of HisTime FactorsCoronary OcclusionElectrodes, ImplantedFollow-Up StudiesAtrial FunctionCardiac Resynchronization Therapy DevicesProspective StudiesPercutaneous Coronary InterventionCerebrovascular CirculationCardiac CathetersTomography, X-Ray ComputedParanasal Sinus NeoplasmsRisk FactorsPhlebographyTachycardia, Atrioventricular Nodal ReentryHeart VentriclesTachycardia, SupraventricularProsthesis ImplantationAtrial SeptumSinoatrial NodeTachycardia, SinusEchocardiographyCoronary Care UnitsDilatation, PathologicVeinsEchocardiography, TransesophagealWolff-Parkinson-White SyndromeBlood Flow VelocityBody Surface Potential MappingPredictive Value of TestsFluoroscopyFeasibility StudiesStentsHeart FailureTachycardia, ParoxysmalMaxillary Sinus NeoplasmsVasodilator AgentsHeart SeptumCardiopulmonary BypassArteriovenous FistulaMitral ValvePulmonary VeinsTachycardia, Ectopic AtrialHeart Block