title: Color Doppler sonography examination of partially obstructed kidneys associated with ureteropelvic junction stone before and after percutaneous nephrolithotripsy: preliminary report.
abstract: OBJECTIVE
  To evaluate resistive index (RI) changes before and after unilateral percutaneous nephrolithotripsy in chronic partially obstructed kidneys due to ureteropelvic junction (UPJ) stones.
  
  
  METHODS
  Intrarenal RI of obstructed and contralateral normal kidneys of 18 patients were recorded immediately before the operations and at postoperative days 1, 7 and 30. Postoperative RI measurements were compared with baseline values for all patients without grouping and separately for different groups according to the preoperative RI value of the obstructed kidney.
  
  
  RESULTS
  Mean age and symptom duration were 27.5 years and 43.8 weeks, respectively. Preoperatively and at all postoperative controls, kidney diameters and renal parenchyma thicknesses were normal in all patients. Mean RI of obstructed kidneys decreased from 0.68 to 0.63 for all patients (P=0.032), from 0.64 to 0.63 for those with preoperative RI<0.70 (P=0.850) and from 0.73 to 0.62 for those with preoperative RI>or=0.70 (P=0.001). In patients with preoperative RI>or=0.70 in obstructed kidney, significant RI decreases were recorded at postoperative day 7 and RI differences between obstructed and contralateral kidneys disappeared after then. No difference was present pre- and postoperatively between the mean RI of obstructed and contralateral kidneys of the patients with RI<0.70. Mean RI of contralateral kidneys were normal preoperatively and showed no significant change postoperatively.
  
  
  CONCLUSIONS
  Preoperative RI levels may indirectly reflect the presence of functionally significant obstruction in chronic obstructed kidneys related to UPJ stones. Patients with RI>or=0.70 may have a good indication for a surgical approach. Normalization of high RI occurs rapidly after percutaneous nephrolithotripsy.
authors.affiliation: Department of Urology, Turgut Ozal Medical Center, Inonu Uniersity School of Medicine, Malatya, Turkey. skilic@inonu.edu.tr
authors.forename: Süleyman
authors.initials: S
authors.lastname: Kiliç
authors.forename: Mustafa Tayfun
authors.initials: MT
authors.lastname: Altinok
authors.forename: Deniz
authors.initials: D
authors.lastname: Ipek
authors.forename: Ali
authors.initials: A
authors.lastname: Beytur
authors.forename: Yasar Can
authors.initials: YC
authors.lastname: Baydinç
authors.forename: Gülsen
authors.initials: G
authors.lastname: Güneş
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006869:Hydronephrosis / Q000000981:diagnostic imaging* / Q000209:etiology / Q000503:physiopathology; D007668:Kidney / Q000098:blood supply / Q000000981:diagnostic imaging; D008096:Lithotripsy / Q000379:methods*; D008297:Male; D008875:Middle Aged; D012079:Renal Circulation / Q000502:physiology; D012720:Severity of Illness Index; D013997:Time Factors; D018615:Ultrasonography, Doppler, Color; D014514:Ureteral Calculi / Q000150:complications / Q000000981:diagnostic imaging* / Q000628:therapy; D014517:Ureteral Obstruction / Q000150:complications / Q000000981:diagnostic imaging* / Q000628:therapy; D014655:Vascular Resistance / Q000502:physiology