title: [Doppler ultrasonography in the function assessment of double J ureteral endoprosthesis in patients with extrinsic ureteral obstruction].
abstract: OBJECTIVE
  The efficacy of internal urinary drainage by double J stent is relatively difficult to evaluate by classical methods. This prospective study evaluated variations of the resistance index (RI) in patients with unilateral extrinsic ureteric obstruction, requiring internal drainage by double J stent.
  
  
  METHODS
  Variations of the resistance index (RI) and the correlations between RI and the results of other investigations were determined in a group of 48 patients with unilateral extrinsic ureteric obstruction, treated by ureteric stent. The presence of urine from the stented ureteric meatus was also assessed.
  
  
  RESULTS
  The preoperative assessment demonstrated a sensitivity of 73% for RI (> 0.7) and 84.5% for DRI for the demonstration of obstruction. Following stenting, RI decreased by 11%, with a mean index of 0.66; the RI was less than 0.07 in 62.5% of cases. The mean index was 0.68 one month later and 0.71 three months later (an increase of 0.05 compared to the post-stent evaluation).
  
  
  CONCLUSIONS
  The resistance index may represent a useful element in the assessment of the efficacy of internal drainage by double J stent, while the presence of urine in the ureteric orifice may not be helpful.
authors: Clinique d'Urologie, Hôpital Clinique d'Urgence Saint Jean, 13, rue Vitan Bârzesti, 75669 Bucarest, Roumanie. geavlete@net4u.ro
authors: P
authors: P
authors: Geavlete
authors: D
authors: D
authors: Georgescu
authors: G
authors: G
authors: Nita
authors: V
authors: V
authors: Cauni
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005500:Follow-Up Studies; D006801:Humans; D008875:Middle Aged; D011446:Prospective Studies; D019736:Prostheses and Implants / Q000009:adverse effects*; D011474:Prosthesis Design; D012680:Sensitivity and Specificity; D018608:Ultrasonography, Doppler; D014517:Ureteral Obstruction / Q000000981:diagnostic imaging* / Q000209:etiology / Q000503:physiopathology