SarcolemmaMyocytes, CardiacMyocardiumHeartHeart VentriclesMyocardial ContractionCalciumSodium-Calcium ExchangerCardiac OutputArrhythmias, CardiacMuscle CellsCardiomegalyCells, CulturedVentricular FunctionPotassium ChannelsSarcoplasmic ReticulumCardiac Surgical ProceduresCalcium Channels, L-TypeDecanoic AcidsHydroxy AcidsDeath, Sudden, CardiacRats, Sprague-DawleyGuinea PigsSodium-Potassium-Exchanging ATPaseKATP ChannelsPatch-Clamp TechniquesDogsMitochondria, HeartIsoproterenolDystrophinHeart AtriaMembrane PotentialsAction PotentialsSodiumMuscle ProteinsCalcium SignalingTime FactorsCardiomyopathiesAnimals, NewbornCardiotonic AgentsRabbitsCaffeineCardiac Pacing, ArtificialRats, WistarHeart FailureCaveolin 3Muscle Fibers, SkeletalRyanodine Receptor Calcium Release ChannelHeart DiseasesMyocardial Reperfusion InjurySarcoplasmic Reticulum Calcium-Transporting ATPasesCalcium ChannelsIschemic Preconditioning, MyocardialMuscle, SkeletalCardiac TamponadeModels, CardiovascularReceptors, Adrenergic, betaAdrenergic beta-AgonistsMyocardial IschemiaElectrophysiologyCalcium-Transporting ATPasesPotassium Channel BlockersMyocardial InfarctionMuscular Dystrophy, AnimalCardiac CatheterizationSarcomeresAdenosine TriphosphateHeart RatePotassium Channels, Inwardly RectifyingPinacidilCell SizeMice, Inbred mdxAnti-Arrhythmia AgentsCardiac MyosinsHeart ArrestDiazoxidePotassiumHemodynamicsKineticsVentricular Function, LeftSodium-Hydrogen AntiporterMyoblasts, CardiacElectrocardiographyMice, TransgenicExcitation Contraction CouplingHeart Conduction SystemSodium ChannelsCardiomyopathy, DilatedCardiac Output, LowCardiac GlycosidesSulfonylurea ReceptorsElectric ConductivityDisease Models, AnimalVentricular RemodelingRyanodineTroponin IIon TransportCalcium-Binding ProteinsSignal TransductionDose-Response Relationship, Drug