Vasodilator AgentsPapaverineNitroprussideVasodilationAcetylcholineVascular ResistanceNitric OxideRegional Blood FlowNitroglycerinForearmEndothelium, VascularHydralazineBradykininVasoconstrictionHemodynamicsBlood PressureNG-Nitroarginine Methyl EsterEpoprostenolCalcitonin Gene-Related PeptideVasoconstrictor AgentsMesenteric ArteriesHyperemiaCoronary CirculationPulmonary CirculationAdenosineHypertension, PulmonaryCoronary VesselsVasomotor SystemSplanchnic Circulationomega-N-MethylarginineNitric Oxide SynthaseDose-Response Relationship, DrugDogsArginineArteriolesEndothelium-Dependent Relaxing FactorsPlethysmographyMuscle, Smooth, VascularAdrenomedullinRenal CirculationCromakalimIndomethacinNitroarginineDipyridamoleMinoxidilPulmonary ArteryIsosorbide DinitrateArteriesBiological FactorsMicrocirculationEnzyme InhibitorsProstaglandinsHeart RateBenzopyrans15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid