Myocardial IschemiaIschemiaPerfusionBrain IschemiaMyocardial Reperfusion InjuryPerfusion ImagingMyocardial Perfusion ImagingCoronary CirculationMyocardiumCoronary DiseaseElectrocardiographyExercise TestHeartReperfusion InjuryTomography, Emission-Computed, Single-PhotonMyocardial ReperfusionMyocardial InfarctionHemodynamicsAngina PectorisDogsCardiotonic AgentsTime FactorsIschemic Preconditioning, MyocardialCoronary VesselsDisease Models, AnimalCoronary AngiographyHeart RateElectrocardiography, AmbulatoryRats, Sprague-DawleyMyocardial ContractionDipyridamoleThallium RadioisotopesVentricular Function, LeftBlood PressureRats, WistarCerebrovascular CirculationArrhythmias, CardiacAdenosineTechnetium Tc 99m SestamibiReperfusionRegional Blood FlowIschemic Attack, TransientCreatine KinaseWarm IschemiaMyocardial StunningVasodilator AgentsOrganotechnetium CompoundsIschemic PreconditioningCollateral CirculationCoronary Artery DiseaseSwineDobutamineEchocardiographyRabbitsMicrocirculationBlood Flow VelocityChemotherapy, Cancer, Regional PerfusionChest PainEchocardiography, StressRadiopharmaceuticalsHeart VentriclesIntraoperative ComplicationsCold IschemiaSensitivity and SpecificityPredictive Value of TestsMyocytes, CardiacAcute DiseaseProspective StudiesCoronary StenosisContrast MediaTroponin ILactic AcidBrainConstrictionOxygen ConsumptionVentricular FibrillationSpinal Cord IschemiaOxygenAnesthesiaIschemic PostconditioningNitroglycerinGerbillinaeThalliumMitochondria, HeartSwine, MiniatureVentricular Dysfunction, LeftLaser-Doppler FlowmetryTroponin TNecrosisHindlimbLactatesMagnetic Resonance ImagingRandom AllocationCardiovascular AgentsInfarction, Middle Cerebral ArteryMagnetic Resonance AngiographyAngina, UnstableHeart Function TestsNitric OxideL-Lactate Dehydrogenase