MyocardiumRegional Blood FlowBlood Flow VelocityCerebrovascular CirculationHeartMyocardial StunningLaser-Doppler FlowmetryDogsMyocardial ContractionHemodynamicsFlow CytometryBlood PressureVascular ResistanceMyocardial IschemiaCoronary CirculationMicrospheresTime FactorsPulsatile FlowMyocardial InfarctionTomography, Emission-ComputedXenon RadioisotopesHeart VentriclesOxygen ConsumptionMicrocirculationOxygenHeart RateMyocardial Reperfusion InjuryModels, CardiovascularCollateral CirculationRats, Sprague-DawleyVasodilationPerfusionSwineTomography, Emission-Computed, Single-PhotonRenal CirculationHyperemiaMyocytes, CardiacBrainDisease Models, AnimalLiver CirculationMyocardial ReperfusionVasodilator AgentsOxygen RadioisotopesCarbon DioxidePulmonary CirculationRheologySplanchnic CirculationRats, WistarRabbitsCardiotonic AgentsBlood VolumeXenonVentricular Function, LeftCoronary DiseaseCapillariesOrganotechnetium CompoundsEchocardiographyUltrasonography, DopplerDose-Response Relationship, DrugMagnetic Resonance ImagingNitric OxideNitrogen RadioisotopesAdenosineArteriesGene FlowBlood Circulation TimeUltrasonography, Doppler, ColorCoronary VesselsPericardiumVasoconstrictionCardiomyopathiesCerebral ArteriesVentricular FunctionPlethysmographyDobutamineTissue SurvivalVentricular RemodelingIschemiaReference ValuesAnoxiaContrast MediaMuscle, SkeletalKineticsOximesPartial PressureStress, MechanicalUltrasonography, Doppler, TranscranialHindlimbCalciumBlood Gas AnalysisHeart AtriaSheepCardiomegalyRadiopharmaceuticalsCardiomyopathy, DilatedEndothelium, VascularAnalysis of VarianceHeart FailureElectrocardiographyCats