EndocardiumPericardiumEndocardial CushionsHeartHeart ValvesHeart VentriclesHeart Conduction SystemDogsMyocardiumEndocardial FibroelastosisHeart AtriaVentricular FunctionEpicardial MappingElectrophysiologic Techniques, CardiacAction PotentialsAtrial AppendageVentricular FibrillationElectrocardiographyPurkinje FibersEndocardial Cushion DefectsCardiac Pacing, ArtificialTachycardia, VentricularBody Surface Potential MappingQuailHeart SeptumModels, CardiovascularMesodermAtrial FunctionCatheter AblationGene Expression Regulation, DevelopmentalMyocardial ContractionMorphogenesisMyocytes, CardiacPapillary MusclesFlecainideChick EmbryoEndomyocardial FibrosisElectrophysiologyReceptor, TIE-2ZebrafishCardiomyopathies4-AminopyridineLIM-Homeodomain ProteinsFetal HeartCoronary CirculationSwineVentricular Function, LeftArrhythmias, CardiacMyocardial IschemiaCicatrix