Radionuclide VentriculographyEchocardiographyVentriculography, First-PassGated Blood-Pool ImagingStroke VolumeRadionuclide AngiographyCerebral VentriculographyHeart VentriclesVentricular Function, LeftSodium Pertechnetate Tc 99mVentricular Dysfunction, LeftPrenalterolEchocardiography, TransesophagealTechnetiumHeartEchocardiography, DopplerHeart AneurysmEchocardiography, Three-DimensionalEchocardiography, Doppler, ColorCardiac VolumeRadionuclide ImagingExercise TestUltrasonography, DopplerElectrocardiographyEchocardiography, StressEchocardiography, Doppler, PulsedCoronary DiseaseMyocardial InfarctionUltrasonography, Doppler, ColorMyocardial ContractionThallium RadioisotopesRadioisotopesCardiac OutputTomography, Emission-Computed, Single-PhotonVentricular Function, RightAngiocardiographyHemodynamicsCardiomyopathy, DilatedProspective StudiesCineangiographyDoppler EffectSensitivity and SpecificityPhysical ExertionDobutamineElectrocardiography, AmbulatoryPredictive Value of TestsUltrasonography, Doppler, PulsedHeart FailureHeart RateBlood Flow VelocityCardiac CatheterizationMitral ValvePacemaker, ArtificialHeart DiseasesFollow-Up StudiesDiastoleRadionuclide GeneratorsPrognosisBlood PressureSystoleTime FactorsUltrasonography, Doppler, TranscranialCesium RadioisotopesAdrenergic beta-AntagonistsMitral Valve InsufficiencyObserver VariationCoronary AngiographyContrast MediaTakotsubo CardiomyopathyWater Pollutants, RadioactiveCoronary CirculationRadiopharmaceuticalsTreatment OutcomeHeart Function TestsReproducibility of ResultsCardiomyopathiesVentricular Dysfunction, RightTechnetium Tc 99m PyrophosphateThalliumStrontium RadioisotopesDiatrizoateMyocardial StunningHeart Septal Defects, AtrialMyocardial IschemiaIothalamate MeglumineAortic Valve InsufficiencyHeart Valve DiseasesHeart AtriaTechnetium Tc 99m SestamibiHeart Defects, CongenitalUltrasonography, PrenatalCardiomyopathy, HypertrophicIopamidolSoil Pollutants, RadioactiveMyocardiumFetal HeartIodine RadioisotopesFeasibility StudiesIodobenzenesAortic Valve