Coronary VasospasmVasospasm, IntracranialCoronary VesselsAngina Pectoris, VariantErgonovineCoronary AngiographyCoronary CirculationIsosorbide DinitrateCoronary Artery DiseaseElectrocardiographyVasodilator AgentsPericardiumSubarachnoid HemorrhageCoronary StenosisAcetylcholineVasoconstrictionAngina PectorisAngioplasty, Balloon, CoronaryDiltiazemCardiac CatheterizationMyocardial InfarctionCoronary DiseaseVasodilationPapaverineCalcium Channel BlockersCoronary Artery BypassNitroglycerinBlood Flow VelocityDogsrho-Associated KinasesVasomotor SystemNitratesMicrocirculationCoronary ThrombosisBasilar ArteryEndothelium, VascularMyocardial Bridgingomega-N-MethylarginineAdenosineVascular ResistanceMyocardial IschemiaHemodynamicsChest PainCoronary AneurysmUltrasonography, InterventionalSwineMicrovascular AnginaCollateral CirculationInfusions, Intra-ArterialIschemic Attack, TransientRisk FactorsNitric OxideHyperemiaCerebral AngiographyCoronary Restenosis