Cardiac ElectrophysiologyElectrophysiological ProcessesElectrophysiologic Techniques, CardiacEpicardial MappingModels, CardiovascularArrhythmias, CardiacHeartMyocytes, CardiacHeart Conduction SystemElectrophysiologyVoltage-Sensitive Dye ImagingElectrophysiological PhenomenaElectrocardiographyAction PotentialsAtrioventricular NodeHeart VentriclesCardiac OutputComputer SimulationLong QT SyndromeCatheter AblationMyocardiumHeart RateSocieties, MedicalCardiac Surgical ProceduresDeath, Sudden, CardiacPotassium ChannelsCardiac Pacing, ArtificialAlgorithmsCardiomegalyHeart DiseasesCardiac CatheterizationCardiac TamponadeRecovery RoomTime FactorsHeart ArrestSocietiesHeart FailureHeart AtriaCardiac Imaging TechniquesMyoblasts, CardiacCardiomyopathiesSocieties, ScientificPatch-Clamp TechniquesEchocardiographyCardiac MyosinsDogsCardiac GlycosidesHemodynamicsMyocardial InfarctionRats, Sprague-DawleyCalciumCardiac Output, LowVentricular Function, LeftOut-of-Hospital Cardiac ArrestMembrane PotentialsTreatment OutcomeMississippiCardiac VolumeVentricular RemodelingVentricular FunctionTroponin IDisease Models, AnimalBlood PressureHeart Defects, Congenital