CaptoprilAngiotensin-Converting Enzyme InhibitorsProlineRadioisotope RenographyReninAdministration, OralBlood PressureHypertension, RenovascularRenin-Angiotensin SystemAngiotensin IAngiotensin IIPeptidyl-Dipeptidase ATechnetium Tc 99m MertiatideTechnetium Tc 99m PentetateHypertensionHydrochlorothiazideIodohippuric AcidSaralasinAntihypertensive AgentsEnalaprilIsosorbideBradykininRats, Inbred SHRKininsHydralazineDose-Response Relationship, DrugRenal Artery ObstructionLosartanTime FactorsHemodynamicsIsosorbide DinitrateRats, WistarKidneyReceptors, BradykininDrug Administration ScheduleRats, Sprague-DawleyDouble-Blind MethodAldosteroneInjections, IntravenousTetrazolesRats, Inbred StrainsRenal CirculationEnalaprilatFurosemideAngiotensin Receptor AntagonistsAdministration, SublingualRats, Inbred WKYPentetic AcidHypertension, RenalHeart Rate