Cardiac ElectrophysiologyElectrophysiological ProcessesCatheter AblationElectrophysiologic Techniques, CardiacEpicardial MappingArrhythmias, CardiacModels, CardiovascularHeartMyocytes, CardiacHeart Conduction SystemElectrophysiologyVoltage-Sensitive Dye ImagingElectrophysiological PhenomenaElectrocardiographyAction PotentialsAtrioventricular NodeHeart VentriclesCardiac OutputComputer SimulationLong QT SyndromeMyocardiumAblation TechniquesHeart RateCardiac Surgical ProceduresDeath, Sudden, CardiacPotassium ChannelsCardiac Pacing, ArtificialAlgorithmsCardiac CatheterizationCardiomegalyHeart AtriaAtrial FibrillationHeart DiseasesCardiac TamponadeMyocardial ContractionTime FactorsTreatment OutcomeHeart ArrestPulmonary VeinsHeart FailureCardiac Imaging TechniquesBody Surface Potential MappingCardiomyopathiesEchocardiographyTachycardia, SupraventricularDogsMyoblasts, CardiacPatch-Clamp TechniquesCardiac MyosinsTachycardia, VentricularRats, Sprague-DawleyHemodynamicsCardiac GlycosidesMyocardial InfarctionCalciumPericardiumVentricular Function, LeftDisease Models, AnimalCardiac Output, LowMembrane PotentialsOut-of-Hospital Cardiac ArrestCardiac VolumeVentricular RemodelingVentricular FunctionFollow-Up StudiesHeart TransplantationTroponin ICells, CulturedProspective StudiesMice, TransgenicPacemaker, ArtificialTachycardia, Atrioventricular Nodal ReentryHeart Defects, CongenitalAnti-Arrhythmia AgentsBlood PressureMice, KnockoutHeart BlockStroke Volume