title: [Treatment of ureteral obstruction with auto-expandable metallic endoprosthesis].
abstract: OBJECTIVE
  To evaluate the efficacy of Nitinol (Memotherm) self-expandible metal stents in the treatment of malignant and non-malignant ureteral obstruction in patients who are not eligible for surgery.
  
  
  METHODS
  A total of 14 ureteral strictures (5 malignant, 9 non-malignant) in 13 patients were treated by the implantation of a Nitinol endoprosthesis. Eight were implanted by the antegrade and 6 by the retrograde route. A mean of 1.3 stents were implanted per patient.
  
  
  RESULTS
  85% of the stents were patent at a mean follow-up of 10.2 months (range 2-28). Four prostheses developed transient obstruction that was resolved by insertion of a double-J catheter for periods that ranged from 2 to 6 months. One stent required a permanent double-J catheter and another stent showed functional obstruction, although it was morphologically patent.
  
  
  CONCLUSIONS
  The Nitinol self-expandible metal stent is effective in the treatment of malignant and non-malignant ureteral obstructions in patients who are not eligible for surgery due to the tumor stage or high surgical risk.
authors.affiliation: Servicio de Urología, Hospital Ramón y Cajal, Madrid, España.
authors.forename: F J
authors.initials: FJ
authors.lastname: Burgos Revilla
authors.forename: V
authors.initials: V
authors.lastname: Gómez Dosantos
authors.forename: C
authors.initials: C
authors.lastname: Carrera Puerta
authors.forename: M
authors.initials: M
authors.lastname: Sánchez Encinas
authors.forename: J
authors.initials: J
authors.lastname: Pascual Santos
authors.forename: T
authors.initials: T
authors.lastname: Llorente
authors.forename: A
authors.initials: A
authors.lastname: Escudero Barrilero
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000497:Alloys; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015607:Stents; D014517:Ureteral Obstruction / Q000628:therapy*
chemical_list: D000497:Alloys; C013616:nitinol
vernacular_title: Tratamiento de la obstrucción ureteral mediante endoprótesis metálicas autoexpandibles.