Diuresis Renography in Equivocal Urinary Tract Obstruction

Abstract

A trial of the value of diuresis renography in equivocal upper urinary tract obstruction is presented. Fifty-two patients were examined by standard renography and renography under a diuretic provocation. The results indicate that the technique is of considerable value in making the vital distinction between dilatation on the excretion urogram due to atonicity and that caused by a genuine obstruction. A quantitative index of the response to diuresis reflecting the degree of impedance to flow is described--the Diuresis Excretion Index. Diuresis renography is recommended in the evaluation of the patient with equivocal urinary tract obstruction.

Laparoscopically Guided External Transanastomotic Stenting in Dismembered Pyeloplasty: A Safe Technique

“…However, this concept does not seem to be widely accepted in pediatric urology. 21 In addition, they report on patients with a significantly higher age, when compared with our series (median age, 11.3 years vs 22 months). Thus, they describe a group of patients with different anatomic preconditions that might be more suitable for placement of short-term retrievable ureteral Double-J stents.…”

“…Indications for surgery were hydronephrosis grade 3 associated with loss of DRF 10% and/or urodynamic relevant obstruction in technetium-99 m-MAG3 diuretic renography according to O'Reilly et al, 21 as well as an aberrant lower pole vessel, detected by ultrasound.…”

“…Stents were removed without anesthesia after a median time of 7 days (range, [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. No intraoperative complications (bleeding caused by stent placement or inability to insert the stent) occurred.…”

Advances in radionuclide evaluation of urinary tract obstruction

“…The introduction of the diuretic renogram in 1978 [28][29][30] was based on an assumption that the radionuclide retained in a dilated nonobstructed collecting system, when challenged with an increased urine flow, will be washed out. Administration of a diuretic to a dilated obstructed system will result in retention of the radio- tracer proximal to the site of obstruction [31] (Fig.…”

Hydrodynamics of the pyeloureter of the pig: An experimental study of the relationship between pressure and flow in the normal, in the obstructed, and in the transsected pyeloureter

“…Furosemide renography is also initially performed conventionally and later supplemented by an injection of furosemide [O'Reilly et al, 1978;Koff et al, 1979;O'Reilly et al, 1979;Koff et al, 1980;O'Reilly and Lupton, 19821. If the drainage curve decreases substantially, the condition is judged as unobstructed, while mildly decreasing or unchanged isotope level is judged as partial or severe obstruction.…”