HeartHeart RateHeart DiseasesHeart Defects, CongenitalHeart FailureCoronary DiseaseHeart TransplantationRheumatic Heart DiseaseMyocardial IschemiaFetal HeartHeart ValvesRisk FactorsHeart AtriaMyocardiumHeart BlockProspective StudiesMyocardial InfarctionHeart Function TestsFollow-Up StudiesMyocardial ContractionHeart Arrest, InducedTime FactorsCarcinoid Heart DiseaseMyocytes, CardiacEchocardiographyCardiomyopathiesHemodynamicsCyanosisCohort StudiesCardiovascular DiseasesVentricular Function, LeftCardiomyopathy, DilatedCardiomegalyCardiac Output, LowStroke VolumeHeart Septal DefectsRisk AssessmentChronic DiseaseIncidenceVentricular Dysfunction, LeftTreatment OutcomeCardiotonic AgentsAge FactorsBiological MarkersAdrenergic beta-AntagonistsHeart Valve ProsthesisRiskHeart SeptumHeart ArrestHeart Failure, SystolicProportional Hazards ModelsHeart Valve DiseasesMyocardial Reperfusion InjuryCause of DeathPerfusionExercise TestRetrospective StudiesHeart, ArtificialAmerican Heart AssociationPredictive Value of TestsSex FactorsHeart InjuriesPrevalenceCase-Control StudiesVentricular RemodelingUnited StatesHeart Rate, FetalAngina PectorisInfant, NewbornHeart Failure, DiastolicPrognosisNatriuretic Peptide, BrainCardiac Pacing, ArtificialHeart Septal Defects, VentricularRheumatic FeverDogsMyocarditisCholesterol, HDLCardiac Surgical ProceduresOxygen ConsumptionDeath, Sudden, CardiacDisease Models, AnimalHypoplastic Left Heart SyndromeAutonomic Nervous SystemSystoleDiastoleDiabetes MellitusCardiac CatheterizationCholesterol, LDLHeart Septal Defects, AtrialStrokeModels, CardiovascularElectrocardiography, AmbulatoryHeart NeoplasmsRats, Sprague-DawleyNational Heart, Lung, and Blood Institute (U.S.)Cross-Sectional StudiesPulmonary Heart DiseaseExerciseCardiology