Collateral CirculationBlood CirculationArteriesVeinsRegional Blood FlowJugular VeinsFemoral VeinPulmonary ArteryHemodynamicsCoronary CirculationDogsBlood PressureCollateral LigamentsCerebrovascular CirculationCircle of WillisKidney CalicesArterial Occlusive DiseasesLiver CirculationCerebral AngiographyCoronary AngiographyAngiographyCoronary OcclusionHypertension, PortalIschemiaAngina PectorisLigationMedial Collateral Ligament, KneeBlood Flow VelocityConstriction, PathologicCoronary VesselsBalloon OcclusionExtracorporeal CirculationPulmonary CirculationCoronary DiseaseMagnetic Resonance AngiographyCineangiographyCarotid Artery, InternalCerebral ArteriesCeliac ArteryAngioplasty, Balloon, CoronaryDoppler EffectCerebral Arterial DiseasesCoronary StenosisHindlimbFemoral ArteryMoyamoya DiseaseCarotid Artery, ExternalNeovascularization, PhysiologicMyocardial InfarctionAngiography, Digital SubtractionTime FactorsBrain IschemiaTomography, X-Ray ComputedCarotid StenosisElectrocardiographyMyocardial IschemiaCardiac CatheterizationInfarction, Middle Cerebral ArteryPhlebographyEmbolization, TherapeuticCerebral InfarctionTreatment OutcomeEnterohepatic CirculationCoronary Artery DiseaseCarotid Artery DiseasesSplanchnic CirculationProspective StudiesStrokeCarotid ArteriesDisease Models, AnimalPlacental CirculationFollow-Up StudiesMagnetic Resonance ImagingBrainBlood Circulation TimeRetrospective StudiesSeverity of Illness IndexVascular Resistance