HeartHeart RateMyocardiumHeart FailurePerfusionMyocardial Reperfusion InjuryHeart DiseasesHeart TransplantationMyocardial ContractionHeart Defects, CongenitalMyocardial IschemiaRats, WistarFetal HeartRats, Sprague-DawleyHeart AtriaMitochondria, HeartIschemic Preconditioning, MyocardialHeart ValvesMyocytes, CardiacCardiotonic AgentsHeart Arrest, InducedHeart Function TestsVentricular Function, LeftMyocardial ReperfusionRats, Inbred StrainsHeart BlockVentricular PressureCardiomegalyTime FactorsMyocardial InfarctionHemodynamicsOxygen ConsumptionCoronary DiseaseCreatine KinaseCalciumSarcolemmaIsoproterenolPhosphocreatineCardiac Output, LowAdenosine TriphosphateCardiomyopathiesHeart InjuriesVentricular RemodelingDisease Models, AnimalDecanoic AcidsCoronary CirculationAdrenergic beta-AntagonistsRNA, MessengerNorepinephrineHydroxy AcidsEnergy MetabolismStroke VolumeVentricular Dysfunction, LeftEchocardiographyHeart VentriclesHeart, ArtificialHeart Failure, SystolicHeart ArrestCardiomyopathy, DilatedDose-Response Relationship, DrugModels, CardiovascularReceptors, Adrenergic, betaAnti-Arrhythmia AgentsAdrenergic beta-AgonistsAnimals, NewbornHeart Rate, FetalHeart SeptumKineticsRheumatic Heart DiseaseSarcoplasmic Reticulum Calcium-Transporting ATPasesSarcoplasmic ReticulumRisk FactorsMagnetic Resonance SpectroscopyL-Lactate DehydrogenaseAnoxiaHeart Valve ProsthesisSodium-Calcium ExchangerDogsCells, CulturedDiastoleSympathetic Nervous SystemGlycolysisHeart Failure, DiastolicDiabetes Mellitus, ExperimentalLactic AcidAmerican Heart AssociationSystoleGlucosePalmitatesAdenosineEndocardiumGlycogenPropranololAgingPotassium ChannelsEnzyme InhibitorsLactatesOxidation-ReductionPyruvic AcidNatriuretic Peptide, Brain