Collateral CirculationCoronary VesselsCoronary Artery DiseaseCoronary AngiographyCoronary CirculationCoronary Artery BypassCoronary DiseaseArteriesCoronary StenosisAngioplasty, Balloon, CoronaryMyocardial InfarctionCoronary OcclusionArterial Occlusive DiseasesCerebral ArteriesAngiographyFemoral ArteryAngina PectorisMyocardial IschemiaElectrocardiographyCollateral LigamentsTreatment OutcomeCircle of WillisTime FactorsCoronary VasospasmCerebrovascular CirculationHemodynamicsConstriction, PathologicCarotid ArteriesTomography, X-Ray ComputedPulmonary ArteryCarotid Artery, InternalCerebral AngiographyDogsBlood Flow VelocityCoronary AneurysmKidney CalicesRegional Blood FlowMagnetic Resonance AngiographyLigationCardiac CatheterizationProspective StudiesCineangiographyFollow-Up StudiesCoronary Artery Bypass, Off-PumpCeliac ArteryLiver CirculationRisk FactorsHypertension, PortalBalloon OcclusionCoronary ThrombosisIschemiaMammary ArteriesCarotid Artery DiseasesMedial Collateral Ligament, KneeStentsBlood PressureCoronary RestenosisCarotid Artery, ExternalRetrospective StudiesCalcinosisVasodilator AgentsCoronary Vessel AnomaliesVasodilationCarotid StenosisRenal ArterySeverity of Illness IndexRadial ArteryMesenteric ArteriesPredictive Value of TestsBlood CirculationBasilar ArteryEndothelium, VascularCerebral Arterial DiseasesAngiography, Digital SubtractionUltrasonography, InterventionalInfarction, Middle Cerebral ArteryDoppler EffectNeovascularization, PhysiologicSwineMyocardial RevascularizationPercutaneous Coronary InterventionBrain IschemiaHindlimbMoyamoya DiseaseIliac ArteryHeartVertebral ArteryEmbolization, TherapeuticDisease Models, AnimalNitroglycerinVasoconstrictionThoracic ArteriesExercise TestStrokeExtracorporeal CirculationRisk AssessmentPhlebographyEchocardiographyMuscle, Smooth, VascularMyocardium