CaptoprilAngiotensin-Converting Enzyme InhibitorsProlineRadioisotope RenographyReninBlood PressureHypertension, RenovascularAngiotensin IRenin-Angiotensin SystemAngiotensin IITechnetium Tc 99m MertiatidePeptidyl-Dipeptidase ATechnetium Tc 99m PentetateHypertensionHydrochlorothiazideIodohippuric AcidSaralasinAntihypertensive AgentsEnalaprilIsosorbideBradykininKininsRats, Inbred SHRHydralazineRenal Artery ObstructionDouble-Blind MethodIsosorbide DinitrateLosartanHemodynamicsReceptors, BradykininTime FactorsKidneyAldosteroneTetrazolesAdministration, OralAngiotensin Receptor AntagonistsRenal CirculationEnalaprilatDrug Therapy, CombinationDrug Administration ScheduleFurosemideRats, Inbred WKYHypertension, Renal