Ventricular Dysfunction, LeftVentricular DysfunctionVentricular Dysfunction, RightVentricular Function, LeftEchocardiographyStroke VolumeHeart FailureCardiomyopathiesHemodynamicsMyocardial ContractionHeartElectrocardiographyMyocardiumNatriuretic Peptide, BrainMyocardial InfarctionHeart VentriclesTime FactorsRadionuclide VentriculographyVentricular RemodelingHypertrophy, Left VentricularThallium RadioisotopesSystoleCardiomyopathy, DilatedTreatment OutcomeMyocardial IschemiaMyocardial StunningDiastoleFollow-Up StudiesDobutamineErectile DysfunctionTomography, Emission-Computed, Single-PhotonCardiotonic AgentsPredictive Value of TestsProspective StudiesExercise TestEchocardiography, DopplerCoronary CirculationCoronary DiseasePrognosisTakotsubo CardiomyopathyDisease Models, AnimalAngiotensin-Converting Enzyme InhibitorsBiological MarkersMitral Valve InsufficiencySeverity of Illness IndexChronic DiseaseEnalaprilVentricular Function, RightBlood PressureCoronary Artery BypassHeart DiseasesVentricular PressureCardiac Output, LowRisk FactorsPulmonary EmbolismDogsCardiac CatheterizationTransposition of Great VesselsRetrospective StudiesArrhythmias, CardiacVasodilator AgentsMyocardial RevascularizationHeart RateAtrial Function, LeftCardiac Pacing, ArtificialTissue SurvivalHeart Function TestsHypertension, PulmonaryHeart AtriaDefibrillators, ImplantableBronchodilator AgentsAtrial Natriuretic FactorCardiac VolumeTechnetium Tc 99m SestamibiSensitivity and SpecificityAortic Valve StenosisCoronary AngiographyTachycardia, VentricularAdrenergic beta-AntagonistsAnalysis of VariancePulmonary Wedge PressureMitral ValveAortic ValveCardiac OutputDouble-Blind MethodAlbuterolRisk AssessmentRats, Sprague-DawleyAcute DiseaseMyocytes, CardiacFibrosisPreexisting Condition CoverageForced Expiratory VolumePulmonary ArteryCase-Control StudiesDose-Response Relationship, DrugGated Blood-Pool ImagingReproducibility of ResultsAtrial PressureCoronary Artery Disease