Myocardial IschemiaIschemiaBrain IschemiaMyocardial Reperfusion InjuryMyocardiumCoronary CirculationElectrocardiographyCoronary DiseaseReperfusion InjuryExercise TestVentricular Dysfunction, LeftHeartMyocardial InfarctionMyocardial ReperfusionCardiotonic AgentsAngina PectorisHemodynamicsDisease Models, AnimalTime FactorsIschemic Preconditioning, MyocardialDogsCoronary VesselsErectile DysfunctionMyocardial ContractionHeart RateElectrocardiography, AmbulatoryRats, Sprague-DawleyVentricular Function, LeftArrhythmias, CardiacCoronary AngiographyTomography, Emission-Computed, Single-PhotonRats, WistarReperfusionBlood PressureMyocardial Perfusion ImagingCreatine KinaseVasodilator AgentsEchocardiographyMyocardial StunningIschemic PreconditioningIschemic Attack, TransientMyocytes, CardiacPerfusionWarm IschemiaDipyridamoleCoronary Artery DiseaseThallium RadioisotopesEndothelium, VascularHeart VentriclesDobutamineAdenosineSwineProspective StudiesBiological MarkersCollateral CirculationMice, Inbred C57BLVentricular DysfunctionTroponin IEchocardiography, StressIntraoperative ComplicationsOxidative StressRabbitsNitroglycerinAcute DiseaseChest PainMitochondria, HeartCold IschemiaPredictive Value of TestsNitric OxideTroponin TRisk FactorsIschemic PostconditioningVentricular FibrillationHeart Function TestsGerbillinaeSpinal Cord IschemiaCardiovascular AgentsApoptosisDiastoleLactic AcidRandom AllocationAnesthesiaSwine, MiniatureStroke VolumeCoronary StenosisNecrosisBrainVasodilationAngina, UnstableAnalysis of VarianceConstrictionNeuroprotective AgentsSystoleOxygen ConsumptionAdenosine TriphosphateSeverity of Illness IndexDose-Response Relationship, DrugMicrocirculationL-Lactate DehydrogenaseAdrenergic beta-Antagonists