Myocytes, CardiacCardiac OutputHeartArrhythmias, CardiacCardiac Surgical ProceduresDeath, Sudden, CardiacCardiomegalyCardiac Pacing, ArtificialCardiac TamponadeHeart DiseasesMyocardiumCardiac CatheterizationMyocardial ContractionHeart VentriclesHeart ArrestTime FactorsHeart RateHeart FailureCardiomyopathiesMyoblasts, CardiacElectrocardiographyCardiac MyosinsCardiac Imaging TechniquesCardiac GlycosidesEchocardiographyHemodynamicsCardiac Output, LowOut-of-Hospital Cardiac ArrestMyocardial InfarctionCardiac VolumeHeart TransplantationDogsVentricular RemodelingVentricular Function, LeftTroponin IBlood PressureDisease Models, AnimalHeart Defects, CongenitalStroke VolumeHeart Function TestsHeart Conduction SystemRats, Sprague-DawleyCardiac Resynchronization TherapyTroponin TCardiopulmonary ResuscitationHeart NeoplasmsCardiac Care FacilitiesCardiomyopathy, DilatedTreatment OutcomeVentricular Dysfunction, LeftCardiotonic AgentsMyocardial IschemiaCells, CulturedModels, CardiovascularCardiac ElectrophysiologyFibrosisCalciumProspective StudiesFetal HeartHeart AtriaMice, Inbred C57BLMice, TransgenicVentricular FunctionHeart InjuriesMice, KnockoutCardiopulmonary BypassBiological MarkersMolecular Sequence DataRats, WistarRisk FactorsFollow-Up StudiesHypertrophy, Left VentricularAtrial Natriuretic FactorMyocarditisTroponinMuscle ProteinsIsoproterenolRetrospective StudiesRNA, MessengerSarcomeresSignal TransductionDose-Response Relationship, DrugPredictive Value of TestsAnimals, NewbornHeart ValvesPericardiumMitochondria, HeartRabbitsCoronary CirculationPacemaker, ArtificialEdema, CardiacRisk AssessmentOxygen ConsumptionMagnetic Resonance Imaging, CineVentricular FibrillationPostoperative ComplicationsNatriuretic Peptide, BrainAnalysis of VarianceMyocardial Reperfusion InjuryMuscle, Skeletal