EndocardiumPericardiumAnterior ChamberHeartEndocardial CushionsHeart ValvesHeart VentriclesHeart Conduction SystemDogsMyocardiumHeart AtriaEndocardial FibroelastosisVentricular FunctionEpicardial MappingElectrophysiologic Techniques, CardiacDiffusion Chambers, CultureAction PotentialsElectrocardiographyAtrial AppendageVentricular FibrillationPurkinje FibersCardiac Pacing, ArtificialEndocardial Cushion DefectsTachycardia, VentricularBody Surface Potential MappingHeart SeptumQuailModels, CardiovascularAtmosphere Exposure ChambersAtrial FunctionMesodermMyocardial ContractionGene Expression Regulation, DevelopmentalCatheter AblationMorphogenesisMyocytes, CardiacPapillary MusclesFlecainideElectrophysiologyChick EmbryoTime FactorsFetal HeartZebrafishSwineCardiomyopathiesEndomyocardial FibrosisVentricular Function, LeftReceptor, TIE-2PerfusionHeart Defects, Congenital4-AminopyridineEchocardiographyCoronary CirculationPacemaker, ArtificialLIM-Homeodomain ProteinsArrhythmias, CardiacRabbitsCicatrixMyocardial IschemiaCoronary VesselsAnti-Arrhythmia AgentsTachycardia