NitroglycerinVasodilator AgentsDrug ToleranceAdministration, CutaneousVasodilationAdministration, SublingualNicorandilCoronary VesselsDogsPentaerythritol TetranitrateBlood PressureAldehyde DehydrogenaseSpasmTilt-Table TestAngina PectorisHeart RateHemodynamicsCoronary CirculationPeripheral Nervous System AgentsVascular ResistanceOintmentsFerricyanidesNitric OxideDouble-Blind MethodBrachial ArteryInfusions, IntravenousCoronary VasospasmAcetylcholineEndothelium, VascularNitric Oxide DonorsIsosorbide DinitrateDiltiazemNitratesCyclic GMPTime FactorsNitroprussideSyncope, VasovagalPapaverineMuscle RelaxationRegional Blood FlowInjections, Intra-ArterialMethylene BlueGuanylate CyclaseAdministration, OralDrug Administration ScheduleInjections, IntravenousCoronary DiseaseScorpion StingsHydralazineFissure in AnoVasoconstrictionCoronary AngiographyCyanamideBlood Flow VelocityRadial ArteryAortaS-NitrosothiolsMuscle, Smooth, VascularVasomotor SystemErgonovineInfusions, ParenteralRadiation Dosage