Reperfusion InjuryXanthine OxidaseMyocardial Reperfusion InjuryXanthineXanthine DehydrogenaseXanthinesReperfusionMyocardial ReperfusionWounds and InjuriesMyocardiumAllopurinolBrain InjuriesIschemic PreconditioningMyocardial IschemiaIschemic Preconditioning, MyocardialRats, Sprague-DawleyIschemiaDisease Models, AnimalMyocardial InfarctionRats, WistarIschemic PostconditioningPeroxidaseCardiotonic AgentsAthletic InjuriesOxypurinolSpinal Cord InjuriesTime FactorsMalondialdehydeFree RadicalsAcute Kidney InjuryHypoxanthineSuperoxide DismutaseWarm IschemiaCreatine KinaseOxidative StressMice, Inbred C57BLLiverNecrosisLung InjuryProtective AgentsMolybdenumPerfusionApoptosisBrain IschemiaHeartCoronary CirculationSuperoxidesL-Lactate DehydrogenaseMitochondria, HeartMyocytes, CardiacInjury Severity ScoreNeutrophil InfiltrationHypoxanthinesFree Radical ScavengersKidneyCardioplegic SolutionsLeg InjuriesAntioxidantsCold IschemiaOrgan PreservationNitric OxideCytoprotectionOrgan Preservation SolutionsReactive Oxygen SpeciesNeutrophilsHemodynamicsRandom AllocationHeart Arrest, InducedAcute Lung InjuryEnzyme InhibitorsMice, KnockoutAlanine TransaminaseAspartate AminotransferasesMyocardial ContractionModels, AnimalAldehyde OxidaseEye InjuriesAdenosineOxygenDogsHydroxyl RadicalRabbitsPurinesInfarction, Middle Cerebral ArteryNeck InjuriesMyocardial StunningNeuroprotective AgentsConstrictionMicrocirculationVentricular Function, LeftLipid PeroxidationCatalaseLiver CirculationP-SelectinTioproninUric AcidRats, Inbred LewAbdominal InjuriesVentricular PressurePteridines