title: Comparison of Two Types of Double-J Ureteral Stents that Differ in Diameter and the Existence of Multiple Side Holes along the Straight Portion in Malignant Ureteral Strictures.
abstract: OBJECTIVE
  This study was decided to evaluate the impact of diameter and the existences of multiple side holes along the straight portion of double-J ureteral stents (DJUS) on early dysfunction of stents placed for malignant ureteral strictures.
  
  
  METHODS
  Between April 2007 and December 2011, 141 DJUSs were placed via a percutaneous nephrostomy (PCN) tract in 110 consecutive patients with malignant ureteral strictures. 7F DJUSs with multiple side holes in the straight portion were placed in 58 ureters of 43 patients (Group 1). 8F DJUSs with three side holes in the proximal 2-cm of the straight portion were placed in 83 ureters of 67 patients (Group 2). The incidence of early DJUS dysfunction was compared between the two groups, and nephrostographic findings were evaluated in the cases of early dysfunction.
  
  
  RESULTS
  Early dysfunction of the DJUS was noted in 14 of 58 patients (24.1 %) in Group 1, which was significantly higher (p = 0.001) than in Group 2 in which only 1 of 83 patients (1.2 %) had early dysfunction of the DJUS. Nephrostographic findings of early dysfunction included dilatation of the pelvicalyceal system, filling defects in the ureteral stent, and no passage of contrast media into the urinary bladder.
  
  
  CONCLUSIONS
  In malignant ureteral strictures, multiple side holes in the straight portion of the 7-F DJUS seem to cause early dysfunction. The 8F DJUSs with three side holes in the proximal 2-cm of the straight portion may be superior at preventing early dysfunction.
authors.affiliation: Department of Radiology, Korea University Guro Hospital, Korea University College of Medicine, #148, Gurodongro, Guro-dong, Guro-Gu, Seoul, 152-703, Korea, acube808@naver.com.
authors.forename: Myung Gyu
authors.initials: MG
authors.lastname: Song
authors.forename: Tae-Seok
authors.initials: TS
authors.lastname: Seo
authors.forename: Chang Hee
authors.initials: CH
authors.lastname: Lee
authors.forename: Kyeong Ah
authors.initials: KA
authors.lastname: Kim
authors.forename: Jun Suk
authors.initials: JS
authors.lastname: Kim
authors.forename: Sang Cheul
authors.initials: SC
authors.lastname: Oh
authors.forename: Jae-Kwan
authors.initials: JK
authors.lastname: Lee
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003251:Constriction, Pathologic; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015607:Stents; D014513:Ureter / Q000601:surgery; D014517:Ureteral Obstruction / Q000628:therapy*