Myocytes, CardiacCardiac OutputHeartArrhythmias, CardiacCardiac Surgical ProceduresDeath, Sudden, CardiacReproducibility of ResultsTime FactorsCardiac Pacing, ArtificialCardiomegalyHeart DiseasesMyocardiumCardiac TamponadeCardiac CatheterizationMyocardial ContractionHeart VentriclesHeart ArrestHeart RateHeart FailureElectrocardiographyHemodynamicsEchocardiographyProspective StudiesCardiomyopathiesBlood PressureMyoblasts, CardiacSensitivity and SpecificityCardiac Imaging TechniquesCardiac MyosinsCardiac GlycosidesCardiac VolumeMyocardial InfarctionVentricular Function, LeftCardiac Output, LowTreatment OutcomeOut-of-Hospital Cardiac ArrestDogsTroponin IPredictive Value of TestsVentricular RemodelingHeart TransplantationObserver VariationStroke VolumeCalciumBiological MarkersReference ValuesHeart Defects, CongenitalModels, CardiovascularRats, Sprague-DawleyHeart Function TestsFollow-Up StudiesTroponin TRisk FactorsVentricular Dysfunction, LeftHeart Conduction SystemDisease Models, AnimalRetrospective StudiesCardiac Resynchronization TherapyEquipment DesignMyocardial IschemiaAlgorithmsCardiomyopathy, DilatedCardiotonic AgentsCells, CulturedAnalysis of VarianceFetal HeartCardiopulmonary ResuscitationHeart NeoplasmsCardiac Care FacilitiesKineticsMagnetic Resonance ImagingModels, BiologicalFibrosisCardiac ElectrophysiologyVentricular FunctionHeart AtriaCalibrationImage Processing, Computer-AssistedBlood Flow VelocityImaging, Three-DimensionalThermodilutionOxygen ConsumptionRisk AssessmentRabbitsRats, WistarMonitoring, PhysiologicOxygenCoronary CirculationCardiopulmonary BypassHeart InjuriesHypertrophy, Left VentricularTroponinPrognosisMice, Inbred C57BLSeverity of Illness IndexSystoleOrgan SizeDose-Response Relationship, DrugTomography, X-Ray ComputedPregnancy