title: Temporary placement of covered retrievable expandable nitinol stents with barbs in high-risk surgical patients with benign prostatic hyperplasia: work in progress.
abstract: OBJECTIVE
  To report the use of a newly constructed, covered, retrievable, expandable nitinol stent with barbs to overcome the problem of stent migration associated with conventional covered prostatic expandable stents and to evaluate prospectively the technical feasibility and clinical effectiveness of the stents in patients with benign prostatic hyperplasia (BPH).
  
  
  METHODS
  A covered retrievable expandable nitinol stent with four barbs was placed with use of an 18-F stent delivery system in seven consecutive patients with symptomatic BPH who had high operative risks. Age range of patients was 62-83 years (mean 74 years). In cases in which the stent migrated, it was replaced with a stent with eight barbs. The stents were routinely removed 4 months after placement using a 21-F stent removal set.
  
  
  RESULTS
  Stent placement was technically successful and well tolerated in six of the seven patients. The remaining patient needed a second stent placement after removal of the first stent. The stent with four barbs migrated into the urinary bladder in four patients (57%); three of these patients received a second stent with eight barbs with good results, and the fourth patient did not need further treatment because his symptoms improved. Routine removal of the stent 4 months after placement was performed in three of the seven patients with good results.
  
  
  CONCLUSIONS
  Retrievable stents with eight barbs seem to overcome the problem of stent migration associated with conventional prostatic expandable stents. Preliminary results suggest that stents with barbs are both feasible and effective in patients with BPH.
authors.affiliation: Department of Urology, Asan Medical Center, University of Ulsan College of Medicine, 388-1, Poongnap 2-dong, Songpa-gu, Seoul, 138-736, Republic of Korea.
authors.forename: Choung-Soo
authors.initials: CS
authors.lastname: Kim
authors.forename: Ho-Young
authors.initials: HY
authors.lastname: Song
authors.forename: In Gab
authors.initials: IG
authors.lastname: Jeong
authors.forename: Hyun Jin
authors.initials: HJ
authors.lastname: Yeo
authors.forename: Eun-Young
authors.initials: EY
authors.lastname: Kim
authors.forename: Jung-Hoon
authors.initials: JH
authors.lastname: Park
authors.forename: Chang Jin
authors.initials: CJ
authors.lastname: Yoon
authors.forename: Sung Hyun
authors.initials: SH
authors.lastname: Paick
authors.forename: Sang Woo
authors.initials: SW
authors.lastname: Park
authors.forename: Jae-Ik
authors.initials: JI
authors.lastname: Bae
authors.forename: Je Hwan
authors.initials: JH
authors.lastname: Won
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000497:Alloys; D002404:Catheterization / Q000009:adverse effects / Q000295:instrumentation*; D020878:Device Removal; D005240:Feasibility Studies; D005548:Foreign-Body Migration / Q000209:etiology / Q000517:prevention & control; D006801:Humans; D008297:Male; D010865:Pilot Projects; D011446:Prospective Studies; D011470:Prostatic Hyperplasia / Q000000981:diagnostic imaging / Q000628:therapy*; D011474:Prosthesis Design; D015641:Radiography, Interventional; D056910:Republic of Korea; D015607:Stents / Q000009:adverse effects; D013997:Time Factors; D016896:Treatment Outcome; D018666:Ureteroscopy
chemical_list: D000497:Alloys; C013616:nitinol