Myocardial ContractionHeartMyocardiumPapillary MusclesVentricular Function, LeftDogsThiamylalHemodynamicsDepression, ChemicalCardiotonic AgentsHeart VentriclesCardiac OutputHeart RateHydrazonesDobutamineAmrinoneIsoproterenolVentricular PressureVentricular FunctionHalothaneEchocardiographyBlood PressureCoronary CirculationAdrenergic beta-AgonistsStroke VolumeCalciumMyocytes, CardiacIsofluranePyridazinesSystoleVentricular Dysfunction, LeftAnestheticsHeart FailureSarcoplasmic Reticulum Calcium-Transporting ATPasesPropranololHeart Function TestsVascular ResistanceMethyl EthersCardiomyopathiesCardiac VolumeAutonomic Nerve BlockPenbutololPerfusionStimulation, ChemicalSarcoplasmic ReticulumCardiomegalyEnfluraneDose-Response Relationship, DrugEthersReceptors, Adrenergic, betaAdrenergic beta-AntagonistsMuscle ContractionCardiomyopathy, DilatedTime FactorsUterine ContractionDiastoleMyocardial IschemiaNitric Oxide SynthaseCalcium-Binding ProteinsPropofolNitric OxideNitric Oxide Synthase Type ICardiovascular SystemRats, WistarModels, CardiovascularHypotensionRats, Sprague-DawleyNorepinephrineAnesthesia, InhalationCardiac CatheterizationCardiac Pacing, ArtificialCalcium-Transporting ATPasesRabbitsElectric StimulationAnesthetics, InhalationSwineCell SizeAnesthetics, IntravenousMyocardial Reperfusion InjuryVerapamilStress, MechanicalEnzyme InhibitorsDisease Models, AnimalElectrocardiographyOxygen ConsumptionAutonomic Nervous SystemCoronary VesselsNifedipineMyocardial InfarctionCatecholaminesVasodilator AgentsEchocardiography, DopplerCyclic GMPModels, AnimalSheepMyometriumEchocardiography, StressCells, CulturedMuscle, SmoothNG-Nitroarginine Methyl Ester