VasoconstrictionCoronary VesselsCoronary CirculationCoronary AngiographyCoronary VasospasmCoronary Artery DiseaseVasoconstrictor AgentsVascular ResistanceViper VenomsDogsReceptors, Adrenergic, alphaAzepinesAngioplasty, Balloon, CoronaryEndothelin-1Coronary DiseaseEndothelinsPhentolamineHemodynamicsReceptors, EndothelinVasodilator AgentsCoronary StenosisHeartCoronary Artery BypassVasodilationPerfusionPropranololBlood PressureAdrenergic alpha-AntagonistsReceptor, Endothelin ANitroglycerinReceptor, Endothelin BSwineAcetylcholinePhysical ExertionNorepinephrineOxygen ConsumptionNitric OxideSympathetic Nervous SystemHeart RateMyocardiumMyocardial IschemiaMuscle, Smooth, VascularEndothelium, VascularBlood Flow VelocityCoronary AneurysmReflexTime FactorsDose-Response Relationship, DrugCoronary ThrombosisMyocardial ContractionRegional Blood FlowEnzyme InhibitorsMyocardial InfarctionCoronary RestenosisCoronary OcclusionPulmonary CirculationArteriolesPercutaneous Coronary InterventionAnoxiaPulmonary ArteryVasomotor SystemRisk FactorsCoronary Care UnitsArteriesForearmPhenylephrineMicrocirculationTreatment OutcomeMesenteric ArteriesShiveringRenal CirculationSkin TemperatureElectrocardiographyStentsProspective Studies15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidAdrenergic alpha-AgonistsAdenosineBody Temperature RegulationFollow-Up StudiesAdrenergic alpha-1 Receptor AgonistsNG-Nitroarginine Methyl EsterUltrasonography, InterventionalAngiotensin IIRats, Sprague-DawleyAngina, UnstableCalcinosisCoronary Artery Bypass, Off-PumpMyocardial RevascularizationPredictive Value of TestsNitric Oxide SynthaseCardiac CatheterizationPlatelet Aggregation InhibitorsMethoxamineNitroprussideHeadache Disorders, PrimaryTyramineHyperemiaTomography, X-Ray ComputedInjections, Intra-Arterial