Ventricular Function, LeftVentricular Function, RightHeartMyocardial ContractionVentricular FunctionVentricular Dysfunction, LeftStroke VolumeMyocardiumEchocardiographyHeart VentriclesHemodynamicsSystoleCoronary CirculationHeart Function TestsEchocardiography, DopplerMyocardial InfarctionVentricular Dysfunction, RightMyocardial IschemiaDiastoleVentricular PressureCardiomyopathiesHeart FailureMyocardial Reperfusion InjuryRadionuclide VentriculographyDobutamineEchocardiography, Doppler, PulsedElectrocardiographyHeart RateTime FactorsCardiomyopathy, DilatedVentricular RemodelingDogsEndocardiumCardiotonic AgentsCardiac OutputMyocardial ReperfusionMagnetic Resonance Imaging, CineBlood PressureVentricular DysfunctionCardiac CatheterizationCoronary DiseaseRadionuclide AngiographyCoronary VesselsGated Blood-Pool ImagingMyocardial StunningHeart DiseasesMyocytes, CardiacCardiac VolumeEchocardiography, Doppler, ColorExercise TestRecovery of FunctionTreatment OutcomeProspective StudiesSwineCardiac Pacing, ArtificialDisease Models, AnimalCoronary Artery BypassEchocardiography, StressMagnetic Resonance ImagingPredictive Value of TestsHeart SeptumFollow-Up StudiesVentriculography, First-PassOxygen ConsumptionTomography, Emission-Computed, Single-PhotonBlood Flow VelocityPerfusionCineangiographyCoronary AngiographyAortic Valve StenosisHypertrophy, Right VentricularSwine, MiniatureHuman RightsAdrenergic beta-AntagonistsHeart Arrest, InducedAngioplasty, Balloon, CoronaryAngiocardiographyCardiac Surgical ProceduresObserver VariationCardiomegalyPropanolaminesMyocarditisReproducibility of ResultsCollateral CirculationHypertrophy, Left VentricularMitral ValveAnalysis of VarianceCardiopulmonary BypassRats, Sprague-DawleyArrhythmias, CardiacCardiomyopathy, HypertrophicCardiac Output, LowMitral Valve InsufficiencyVascular ResistancePericardiumRats, WistarModels, AnimalFeasibility StudiesContrast MediaGold Radioisotopes