ElectrocardiographyArrhythmias, CardiacHeartHeart RateHeart Conduction SystemVectorcardiographyMyocytes, CardiacDeath, Sudden, CardiacMyocardial InfarctionScienceElectrocardiography, AmbulatorySignal Processing, Computer-AssistedHeart DiseasesCardiac OutputEchocardiographyHeart VentriclesLong QT SyndromeBundle-Branch BlockChest PainCardiac Pacing, ArtificialPredictive Value of TestsTachycardiaTime FactorsVentricular FibrillationTachycardia, VentricularSyncopeHeart BlockProspective StudiesExercise TestCardiac Complexes, PrematureTelemetryCardiac Surgical ProceduresMyocardial IschemiaPhonocardiographyBody Surface Potential MappingMyocardiumCardiac CatheterizationCoronary DiseaseCardiomegalyAnti-Arrhythmia AgentsVentricular Premature ComplexesDiagnosis, Computer-AssistedCardiomyopathiesSensitivity and SpecificityAutonomic Nervous SystemAtrial FibrillationArrhythmia, SinusBlood PressureFollow-Up StudiesMonitoring, PhysiologicBradycardiaCreatine KinaseMyocardial ContractionCoronary AngiographyPericarditisHeart FailureElectrophysiologic Techniques, CardiacAjmalineDeath, SuddenRisk FactorsAngina PectorisVentricular Function, LeftCardiomyopathy, HypertrophicHeart AtriaHypertrophy, Left VentricularTreatment OutcomeHeart ArrestVentricular Dysfunction, LeftHemodynamicsStroke VolumeAtrioventricular BlockPrognosisPre-Excitation SyndromesRetrospective StudiesPacemaker, ArtificialClinical Enzyme TestsWolff-Parkinson-White SyndromeVentricular FunctionModels, CardiovascularCardiomyopathy, DilatedRisk AssessmentHeart AuscultationDogsTakotsubo CardiomyopathyTachycardia, SupraventricularTachycardia, ParoxysmalCardiac-Gated Imaging TechniquesReproducibility of ResultsKinetocardiographyTroponin IHeart Function TestsCardiac Resynchronization TherapyCatheter AblationAngiocardiographyAtrioventricular NodePericardiumPortraits as TopicCardiac VolumeTroponin TCardiac Tamponade