NicardipineNitroprussideFerricyanidesVasodilator AgentsNitric Oxide DonorsSodiumNitric OxideCalcium Channel BlockersNifedipineVasodilationAcetylcholineCyclic GMPForearmBlood PressureHypotension, ControlledEndothelium, VascularNG-Nitroarginine Methyl Esteromega-N-MethylarginineMuscle RelaxationDose-Response Relationship, DrugDihydropyridinesNitric Oxide SynthaseVasoconstrictor AgentsVerapamilGuanylate CyclaseS-Nitroso-N-AcetylpenicillamineArginineRegional Blood FlowPhenylephrineEnzyme InhibitorsHeart RateDiltiazemSodium ChannelsVascular ResistancePenicillamineNitroarginineVasoconstrictionMuscle, Smooth, VascularHemodynamicsOxadiazolesNorepinephrineTrimethaphanAorta, ThoracicMolsidomineMuscle ContractionNitroglycerinDogsHypertensionFlunarizineInfusions, Intra-ArterialBradykininRats, WistarMethylene BlueCalciumRats, Sprague-DawleyMesenteric ArteriesPlethysmographySodium NitriteMuscle, SmoothArteriolesAntihypertensive AgentsRabbitsCoronary VesselsPurinonesIontophoresisNitroso CompoundsSodium, DietaryRats, Inbred SHRCromakalimMicrocirculationBaroreflexVasomotor SystemPotassiumSodium ChlorideFelodipine15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidArteriesQuinoxalines