Myocytes, CardiacMyocardiumHeartMyocardial ContractionArrhythmias, CardiacHeart VentriclesCardiac OutputCardiomegalyTroponin ICells, CulturedMyoblasts, CardiacCardiac MyosinsModels, CardiovascularCalciumHeart AtriaTroponinSodium ChannelsCardiac Surgical ProceduresHeart DiseasesDeath, Sudden, CardiacCardiomyopathiesNAV1.5 Voltage-Gated Sodium ChannelHeart TransplantationTime FactorsMyofibrilsTroponin CTroponin TVentricular FunctionSarcomeresHeart FailureKv1.5 Potassium ChannelFetal HeartMyosinsMembrane PotentialsPotassium ChannelsPotassium Channels, Voltage-GatedMuscle ProteinsPatch-Clamp TechniquesMuscle CellsCardiac Pacing, ArtificialHeart Conduction SystemAction PotentialsElectrophysiologyMitochondria, HeartAnimals, NewbornMyocardial InfarctionCardiotonic AgentsConnectinMyocardial IschemiaCalcium Channels, L-TypeCardiac TamponadeElectrocardiographyCardiomyopathy, HypertrophicHeart RateFibroblastsRats, Sprague-DawleyCardiac CatheterizationPotassium Channel BlockersGuinea PigsRNA, MessengerVentricular MyosinsCell DifferentiationCardiac ElectrophysiologyEther-A-Go-Go Potassium ChannelsDogsSarcolemmaMolecular Sequence DataCardiomyopathy, DilatedAnti-Arrhythmia AgentsRabbitsIsoproterenolCardiomyopathy, Hypertrophic, FamilialFibrosisLong QT SyndromeAtrial FunctionHeart ArrestIon Channel GatingCreatine Kinase, Mitochondrial FormActinsVentricular RemodelingDose-Response Relationship, DrugMice, TransgenicCell LineGene Expression RegulationSignal TransductionKineticsEndocardiumDisease Models, AnimalSodium-Calcium ExchangerHeart ValvesStem CellsGene ExpressionSodiumKCNQ1 Potassium ChannelRats, WistarRyanodine Receptor Calcium Release ChannelHemodynamicsMutationAmino Acid SequenceLoratadine