title: [Value of duplex sonography in diagnosis of renal artery stenosis and its value in follow-up after angioplasty (PTA)].
abstract: The assessment of the renal arteries is particularly important in the detection of a renovascular cause of the arterial hypertension. The purpose of the present study was twofold: to evaluate the accuracy of duplex scanning in non-invasively diagnosing renal artery stenoses in hypertensive patients, and to determine the results of transluminal angioplasty of renal artery stenoses as assessed by duplex scanning. In 76 patients with arterial hyertension, 170 renal arteries (18 kidneys supplied by two renal arteries) were examined by both duplex scanning and angiography (DSA in intraarterial and intravenous technique, and conventional arteriography). Peak systolic and end-diastolic flow velocity parameters as well as the Pourcelot-index were determined in the proximal renal artery and compared with the indendently performed angiography. In 102 angiographically proven normal renal arteries, mean +/- SD peak systolic and end-diastolic velocity values were 84.7 +/- 13.9 cm/s and 31.2 +/- 7.8 cm/s, respectively, with a Pourcelot-index of 0.66 +/- 0.07. For detecting renal artery stenoses greater than 50%, duplex scanning had a sensitivity of 86%, and a specificity of 83% for a systolic peak velocity of 140 cm/s and more in the renal artery. In 13 patients with 14 stenosed renal arteries, duplex scanning and intraarterial DSA densitometry were performed before and after transluminal angioplasty of the renal artery stenoses. There was fairly good agreement between transstenotic peak systolic velocities and densitometrically determined degrees of stenosis in the renal artery (r = 0.84). These results show that duplex scanning is an accurate noninvasive diagnostic tool in detecting proximal renal artery stenoses.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Internistische Abteilung, Aggertalklinik, Engelskirchen.
authors.forename: W
authors.initials: W
authors.lastname: Schäberle
authors.forename: A
authors.initials: A
authors.lastname: Strauss
authors.forename: D
authors.initials: D
authors.lastname: Neuerburg-Heusler
authors.forename: F J
authors.initials: FJ
authors.lastname: Roth
mesh_terms: D000328:Adult; D000368:Aged; D000800:Angioplasty, Balloon; D000818:Animals; D001783:Blood Flow Velocity / Q000502:physiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D051379:Mice; D008875:Middle Aged; D012372:ROC Curve; D012078:Renal Artery Obstruction / Q000000981:diagnostic imaging* / Q000628:therapy; D014463:Ultrasonography
vernacular_title: Wertigkeit der Duplexsonographie in der Diagnostik der Nierenarterienstenose und ihre Eignung in der Verlaufskontrolle nach Angioplastie (PTA).