Screening for renovascular hypertension

N. R. Dunnick, George N Sfakianakis

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

The most common curable cause of high blood pressure is renovascular hypertension. Although hypertension is common in the United States, only a minority, approximately 1%, of patients have a renovascular cause. Using clinical criteria, a subgroup of these patients can be selected in which the prevalence of renovascular hypertension will be approximately 15%. In these selected patients, it is appropriate to proceed to a radiographic screening modality to look for a significant renal artery stenosis. The choice of modality should reflect the strengths and expertise of each specific institution. Hypertensive urography is no longer recommended for screening. Excellent results have been reported with intravenous DSRA in institutions where a strong interest in this procedure exists. Furthermore, intravenous DSRA is easily coupled with the collection of renal vein samples for renin assay. Intravenous DSRA, however, has not maintained widespread use. Although the radionuclide renogram is no longer adequate as a radiographic screening tool, stimulation with an ACE inhibitor, such as captopril or enalaprilat, may produce excellent results. In many institutions, this is the most appropriate examination. Furthermore, it is relatively noninvasive. Merely detecting a significant renal artery stenosis does not, however, mean the patient has renovascular hypertension. Both hypertension and a renal artery stenosis may be present and not be causally related. Because renovascular hypertension is, at least initially, renin mediated, the demonstration of increased renin production by the ipsilateral kidney should confirm renovascular hypertension. Prospective application of these results to patients undergoing revascularization techniques, however, has been disappointing. This may be related to problems in patient preparation, sample collection, renin assay, or even the physiology of chronic hypertension, which is incompletely renin mediated. Thus, offering revascularization only to those patients with lateralizing renal vein renins is not appropriate. If radiographic screening is limited to those patients at greatest likelihood for a renovascular etiology, intra-arterial DSRA or conventional arteriography may be used. These techniques most reliably detect renal artery stenosis. Their main disadvantage lies in their relatively invasive nature, as an arterial puncture is required. The poor predictive value of selective RVRRs implies that revascularization may be attempted without awaiting those results. If percutaneous transluminal renal angioplasty can be performed with a satisfactorily low complication rate, both the diagnostic and the interventional procedure may be undertaken at the same setting. It is expected that further refinements in these diagnostic procedures, particularly with the use of stimulating drugs such as ACE inhibitors, will lead to further improvement in the diagnostic results. The excellent results reported with both percutaneous transluminal angioplasty and surgical revascularization techniques provide an attractive therapeutic option. As the complication rates continue to decrease, revascularization may be offered to any hypertensive patient in hopes that hypertension may be cured or that a more accelerated form of hypertension or renal insufficiency will not develop.

Original languageEnglish
Pages (from-to)497-510
Number of pages14
JournalRadiologic Clinics of North America
Volume29
Issue number3
StatePublished - Jan 1 1991
Externally publishedYes

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Renovascular Hypertension
Renal Artery Obstruction
Renin
Hypertension
Renal Veins
Angioplasty
Angiotensin-Converting Enzyme Inhibitors
Enalaprilat
Kidney
Urography
Captopril
Punctures
Radioisotopes
Renal Insufficiency
Angiography

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

Cite this

Dunnick, N. R., & Sfakianakis, G. N. (1991). Screening for renovascular hypertension. Radiologic Clinics of North America, 29(3), 497-510.

Screening for renovascular hypertension. / Dunnick, N. R.; Sfakianakis, George N.

In: Radiologic Clinics of North America, Vol. 29, No. 3, 01.01.1991, p. 497-510.

Research output: Contribution to journalArticle

Dunnick, NR & Sfakianakis, GN 1991, 'Screening for renovascular hypertension', Radiologic Clinics of North America, vol. 29, no. 3, pp. 497-510.
Dunnick NR, Sfakianakis GN. Screening for renovascular hypertension. Radiologic Clinics of North America. 1991 Jan 1;29(3):497-510.
Dunnick, N. R. ; Sfakianakis, George N. / Screening for renovascular hypertension. In: Radiologic Clinics of North America. 1991 ; Vol. 29, No. 3. pp. 497-510.
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