Spinal Cord IschemiaSpinal CordParaplegiaSpinal Cord InjuriesIschemiaAortic Aneurysm, ThoracicParaparesisCerebrospinal Fluid PressureConstrictionReperfusion InjuryAorta, ThoracicReperfusionBlood Vessel Prosthesis ImplantationAortographyRabbitsInjections, SpinalSubclavian ArteryInfarctionSpinal Cord DiseasesParaparesis, SpasticMonitoring, IntraoperativeEvoked Potentials, SomatosensoryMyocardial IschemiaBrain IschemiaThoracic ArteriesAortic Aneurysm, AbdominalSpinal Cord CompressionTime FactorsSpinal Cord NeoplasmsDrainageMotor NeuronsEvoked Potentials, MotorIschemic PreconditioningAorta, AbdominalDisease Models, AnimalAortic DiseasesNeuroprotective AgentsEndovascular ProceduresNeurologic Examination