hub sciencedirect scopus applications register login login go to scival suite username: password: remember me | not registered? Forgotten your username or password? Go to athens / institution login remote access activation home publications search my settings my alerts shopping cart help export citation purchase more options... buy generic viagra Email article signed up for journal alerts [remove] alert me about new articles in this journal your selection(s) could not be saved due to an internal error. is viagra covered by medical insurance Please try again. Search     all fields     author advanced search     journal/book title     volume   issue   page search tips article outline is loading... Javascript required for article outline seminars in nuclear medicine volume 19, issue 2, april 1989, pages 79–88 evaluation of the hypertensive patient renovascular hypertension: etiology and pathophysiology thomas g. cheap viagra Pickering cardiovascular center, the new york hospital-cornell university medical center, new york, usa available online 1 july 2006 how to cite or link using doi permissions & reprints view full text purchase $31. the effects of viagra on young men 50 evidence from animal studies demonstrates that the renin-angiotensin (ang ii) system and sodium retention play major roles in experimental renovascular hypertension (rvh). Two basic models have been described. In the first, one-clip two-kidney goldblatt hypertension, the ischemic kidney secretes renin, which leads to increased ang ii formation and hence elevation of blood pressure (bp). jake gyllenhaal viagra salesman As bp rises, sodium excretion by the intact contralateral kidney increases (pressure natriuresis); therefore, there is no sodium retention. In the second, one-clip one-kidney goldblatt hypertension, the contralateral kidney is removed. buy viagra online In this case the pressure natriuresis can no longer occur, and sodium retention occurs. The ensuing expansion of plasma volume inhibits renin secretion, so that in this model the renin level is normal or low. Following the clipping of the renal artery, renal blood flow and pressure are maintained distal to the stenosis by an ang ii-mediated vasoconstriction. This acts prefrrentially on the efferent glomerular arterioles, so that the ratio of preglomerular to postglomerular resistance is reduced, which helps to maintain glomerular filtration despite the reduced renal perfusion pressure. generic viagra without prescription In the contralateral kidney the afferent arteriolar resistance is increased, probably as a direct result of exposure to the higher intrarenal arterial pres. viagra no prescription


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