Ventricular FibrillationAtrial FibrillationElectric CountershockHeart ArrestElectrocardiographyArrhythmias, CardiacCardiopulmonary ResuscitationAnti-Arrhythmia AgentsTachycardia, VentricularDefibrillatorsHeart Conduction SystemCardiac Pacing, ArtificialDeath, Sudden, CardiacDefibrillators, ImplantableElectrophysiologic Techniques, CardiacCatheter AblationHeartAmiodaroneBody Surface Potential MappingBrugada SyndromeHeart AtriaMyocytes, CardiacDogsCardiac Complexes, PrematureResuscitationHeart VentriclesTime FactorsHeart RateRefractory Period, ElectrophysiologicalTachycardiaPericardiumHeart MassageOut-of-Hospital Cardiac ArrestTreatment OutcomePulmonary VeinsEndocardiumMyocardial IschemiaSwineMyocardial InfarctionProcainamideFlecainideCardiac Surgical ProceduresModels, CardiovascularAction PotentialsCardiac OutputFollow-Up StudiesMyocardiumElectrocardiography, AmbulatoryDeath, SuddenAtrial FlutterWarfarinProspective StudiesHeart DiseasesRecurrenceBundle-Branch BlockAnticoagulantsEmergency Medical ServicesPacemaker, ArtificialLidocaineNAV1.5 Voltage-Gated Sodium ChannelVentricular Premature ComplexesEpicardial MappingMyocardial Reperfusion InjurySyncopeHypothermia, InducedRisk FactorsVoltage-Sensitive Dye ImagingSotalolDisease Models, AnimalElectrophysiologyAtrial AppendageHemodynamicsMyocardial ContractionDisopyramideWolff-Parkinson-White SyndromeHeart FailureCardiac ElectrophysiologyPerfusionFourier AnalysisPropafenoneRetrospective StudiesElectric InjuriesPredictive Value of TestsEchocardiographySyndromeCardiomyopathiesVentricular FunctionPurkinje FibersSignal Processing, Computer-AssistedCardiac CatheterizationVentricular Function, LeftHypokalemiaAdrenergic beta-AntagonistsBlood PressureCoronary CirculationStroke VolumeRisk AssessmentAtrial FunctionCoronary DiseaseLong QT Syndrome