HeartHeart RateHeart FailureHeart DiseasesHeart TransplantationHeart Defects, CongenitalFetal HeartHeart ValvesHeart AtriaHeart BlockMyocardiumHeart Arrest, InducedTime FactorsHeart Function TestsMyocardial ContractionMyocardial IschemiaMyocytes, CardiacHemodynamicsCoronary DiseaseRisk FactorsVentricular Function, LeftCardiac Output, LowPerfusionCardiomegalyMyocardial InfarctionCardiomyopathy, DilatedHeart, ArtificialHeart Failure, SystolicCardiomyopathiesHeart InjuriesCardiotonic AgentsDisease Models, AnimalEchocardiographyHeart SeptumMyocardial Reperfusion InjuryStroke VolumeHeart Rate, FetalRheumatic Heart DiseaseRats, Sprague-DawleyHeart ArrestProspective StudiesHeart Valve ProsthesisDogsVentricular Dysfunction, LeftAdrenergic beta-AntagonistsFollow-Up StudiesVentricular RemodelingRats, WistarChronic DiseaseHeart Failure, DiastolicOxygen ConsumptionTreatment OutcomeAmerican Heart AssociationMolecular Sequence DataRNA, MessengerMice, Inbred C57BLAutonomic Nervous SystemMutationSignal TransductionCardiac Pacing, ArtificialCalciumHeart Septal DefectsModels, CardiovascularHypoplastic Left Heart SyndromeCells, CulturedSympathetic Nervous SystemHeart NeoplasmsPhenotypeExercise TestNatriuretic Peptide, BrainMice, KnockoutNational Heart, Lung, and Blood Institute (U.S.)Ventricular PressureModels, BiologicalDose-Response Relationship, DrugRabbitsBiological MarkersAge FactorsAgingCohort StudiesRisk AssessmentKineticsAmino Acid SequenceSystoleCardiovascular DiseasesRetrospective StudiesIsoproterenolDiastoleUnited StatesEndocardiumBase SequenceEnergy MetabolismPrognosisPredictive Value of TestsNorepinephrinePropanolaminesGene Expression RegulationIschemic Preconditioning, MyocardialGene ExpressionMyocarditis