[Temporary and permanent NiTi stents in percutaneous surgery for ureteropelvic segment stricture]

A total of 18 roentgenoendoscopic percutaneous interventions for strictures of the ureteropelvic segment (UPS) have been made by the authors from the beginning of 2004: in 15 (83.3%) females and 3 (16.7%) males aged 16-48 years. Recurrent strictures developed in 11 (61.1%) patients after operations by Kuchere, Pristlay, Andersen-Hines, in 7 (38.9%) patients the strictures were primary. UPS bougieurage and endotomy were made in 3 and 15 patients, respectively. UPS intubation with a PVC tube was made in 2 cases, with a permanent NiTi stent-crown--in 5 cases, temporary stent--in 9 cases, in 2 cases intubation was not made. Complete recovery of UPS passability and significant reduction of hydronephrosis were seen in 15 (83.3%) patients, insignificant effect was registered in 3 patients (one case of PVC tube intubation, one case of NiTi temporary stent, one case of no intubation). Efficacy in patients with permanent stent was 100%, in patients with temporary stent--88.9%, in patients with a PVC tube and without intubation--in 50%. Novel techniques of intubation with permanent and temporary stents with shape memory after percutaneous correction of UPS stricture are promising in the treatment of patients with this pathology of the upper urinary tract and may become an operation of choice.