ElectrocardiographyArrhythmias, CardiacMyocytes, CardiacHeartCardiac OutputDeath, Sudden, CardiacHeart RateHeart Conduction SystemHeart DiseasesMyocardial InfarctionVectorcardiographyCardiac Surgical ProceduresElectrocardiography, AmbulatoryHeart VentriclesBrugada SyndromeCardiac Pacing, ArtificialEchocardiographySignal Processing, Computer-AssistedTime FactorsCardiomegalyMyocardiumCardiac CatheterizationLong QT SyndromePredictive Value of TestsBundle-Branch BlockCardiomyopathiesProspective StudiesMyocardial ContractionTachycardiaVentricular FibrillationChest PainMyocardial IschemiaTachycardia, VentricularHeart ArrestHeart BlockHeart FailureExercise TestSyncopeBlood PressureCardiac Complexes, PrematureCoronary DiseaseCardiac TamponadeTelemetrySensitivity and SpecificityAnti-Arrhythmia AgentsTreatment OutcomeFollow-Up StudiesPhonocardiographyVentricular Function, LeftHemodynamicsAutonomic Nervous SystemRisk FactorsBody Surface Potential MappingAtrial FibrillationVentricular Premature ComplexesDiagnosis, Computer-AssistedStroke VolumeVentricular Dysfunction, LeftBradycardiaHeart AtriaCreatine KinaseArrhythmia, SinusMonitoring, PhysiologicCoronary AngiographyElectrophysiologic Techniques, CardiacHypertrophy, Left VentricularTroponin ICardiomyopathy, HypertrophicAlgorithmsCardiomyopathy, DilatedRetrospective StudiesPericarditisDogsModels, CardiovascularPrognosisCardiac VolumeDeath, SuddenVentricular FunctionHeart Function TestsCardiac Resynchronization TherapyPacemaker, ArtificialRisk AssessmentOut-of-Hospital Cardiac ArrestAngina PectorisReproducibility of ResultsTroponin THeart Defects, CongenitalMyoblasts, CardiacAjmalineAtrioventricular BlockVentricular RemodelingCardiac MyosinsCardiac Imaging TechniquesHeart TransplantationPericardiumCardiac GlycosidesHeart AuscultationPre-Excitation SyndromesCardiac-Gated Imaging TechniquesHeart Injuries