Myocytes, CardiacCardiac OutputHeartArrhythmias, CardiacCardiac Surgical ProceduresDeath, Sudden, CardiacTreatment OutcomeCardiac Pacing, ArtificialCardiomegalyCardiac TamponadeHeart DiseasesMyocardiumCardiac CatheterizationMyocardial ContractionTime FactorsHeart ArrestHeart VentriclesHeart FailureElectrocardiographyMyoblasts, CardiacCardiomyopathiesCardiac MyosinsCardiac Imaging TechniquesHeart RateCardiac GlycosidesEchocardiographyMyocardial InfarctionHemodynamicsCardiac Output, LowProspective StudiesDisease Models, AnimalOut-of-Hospital Cardiac ArrestVentricular RemodelingHeart TransplantationCardiac VolumeVentricular Function, LeftTroponin IDouble-Blind MethodFollow-Up StudiesDose-Response Relationship, DrugDogsBlood PressureHeart Defects, CongenitalRats, Sprague-DawleyStroke VolumeCardiac Resynchronization TherapyHeart Function TestsHeart Conduction SystemTroponin TRetrospective StudiesCardiopulmonary ResuscitationCardiotonic AgentsMyocardial IschemiaHeart NeoplasmsCardiac Care FacilitiesVentricular Dysfunction, LeftCardiomyopathy, DilatedCells, CulturedCardiac ElectrophysiologyFibrosisCalciumModels, CardiovascularDrug Therapy, CombinationMice, Inbred C57BLHeart AtriaFetal HeartVentricular FunctionRisk FactorsMice, TransgenicHeart InjuriesRats, WistarPostoperative ComplicationsDrug Administration ScheduleCardiopulmonary BypassPredictive Value of TestsBiological MarkersRisk AssessmentTroponinIsoproterenolHypertrophy, Left VentricularMyocarditisRabbitsSignal TransductionAtrial Natriuretic FactorAdministration, OralMice, KnockoutMuscle ProteinsPericardiumSarcomeresPrognosisPacemaker, ArtificialAnimals, NewbornHeart ValvesVentricular FibrillationMitochondria, HeartRandomized Controlled Trials as TopicSurvival AnalysisAnti-Arrhythmia AgentsSeverity of Illness IndexAnalysis of Variance