HeartMyocardiumMyocytes, CardiacMyocardial ContractionPhysiologyCardiac OutputArrhythmias, CardiacCardiac Surgical ProceduresDeath, Sudden, CardiacCardiomegalyCardiac Pacing, ArtificialCardiac TamponadeHeart DiseasesCardiac CatheterizationHeart ArrestHeart VentriclesTime FactorsHeart FailureMyoblasts, CardiacCardiomyopathiesElectrocardiographyCardiac MyosinsCardiac Imaging TechniquesHeart RateCardiac GlycosidesEchocardiographyHemodynamicsCardiac Output, LowOut-of-Hospital Cardiac ArrestMyocardial InfarctionDelivery of Health CareHealth PersonnelCardiac VolumeHeart TransplantationVentricular RemodelingTroponin IVentricular Function, LeftTreatment OutcomeHeart Defects, CongenitalBlood PressureProspective StudiesStroke VolumeCardiac Care FacilitiesCardiopulmonary ResuscitationHeart Function TestsTroponin TCardiac Resynchronization TherapyHeart Conduction SystemDogsRetrospective StudiesHeart NeoplasmsModels, CardiovascularCardiotonic AgentsMyocardial IschemiaVentricular Dysfunction, LeftCardiomyopathy, DilatedRats, Sprague-DawleyCardiac ElectrophysiologyUnited StatesRisk FactorsCalciumDisease Models, AnimalFibrosisCells, CulturedFetal HeartHealth Care CostsFollow-Up StudiesHeart AtriaVentricular FunctionHealthcare DisparitiesUnited States Agency for Healthcare Research and QualityHeart InjuriesRisk AssessmentMice, TransgenicPredictive Value of TestsCardiopulmonary BypassSignal TransductionMice, Inbred C57BLTroponinBiological MarkersHypertrophy, Left VentricularSarcomeresMuscle ProteinsIsoproterenolMyocarditisAtrial Natriuretic FactorMice, KnockoutRats, WistarReproducibility of ResultsPericardiumAnimals, NewbornMitochondria, HeartPacemaker, ArtificialPostoperative ComplicationsHeart ValvesQuestionnairesHealth Services AccessibilityMagnetic Resonance Imaging, CineEdema, CardiacCoronary Circulation