Metallic stent in the treatment of ureteral obstruction: experience of single institute.
BACKGROUND
The Resonance(®) metallic stent has been reported to be sufficient for the management of malignant extrinsic ureteral obstructions within a 12-month time period. To determine the effectiveness in each specific patient group, we report our experience using the Resonance(®) stent in the treatment of ureteral obstructions.


METHODS
We retrospectively reviewed 20 patients (23 stents) who successfully received the Resonance(®) metallic stents and divided them into a patent group (n = 19) and an obstructive group (n = 4) according to the treatment results. Twenty-one stents were inserted via cystoscopy or ureteroscopy in a retrograde fashion. The remaining two were inserted via percutaneous nephrostomy in an antegrade manner. Follow-up serum creatinine measurements and sonography were performed. The overall ureteral patency rate and the risk of stent failure were evaluated.


RESULTS
The overall ureteral patency rate was 82.6% (19/23). Patients with previous radiotherapy had a 50% (4/8) patency rate which was significantly lower than non-radiotherapy patients (100%, 15/15, p = 0.028). Malignant obstructions in those other than radiotherapy patients had a 100% patency rate (5/5). Benign obstructions in those other than radiotherapy patients had a 100% patency rate (10/10). In the radiotherapy patients, the mode of therapy did not dominate the stent outcome.


CONCLUSIONS
Patients with ureteral obstructions can be treated sufficiently with the Resonance(®) metallic stent. Patients who had gynecological malignancies and received radiotherapy had a higher failure rate after Resonance(®) metallic stent insertion.
Division of Urology, Department of Surgery, Taichung Veterans General Hospital, Taichung, Taiwan, ROC.
Chien-Chang
CC
Li
Jian-Ri
JR
Li
Li-Hua
LH
Huang
Siu-Wan
SW
Hung
Cheng-Kuang
CK
Yang
Shiang-Shian
SS
Wang
Chuan-Su
CS
Chen
Yen-Chuan
YC
Ou
Hao-Chung
HC
Ho
Chung-Kuang
CK
Su
Wen-Ming
WM
Chen
Chen-Li
CL
Cheng
Chi-Rei
CR
Yang
Kun-Yuan
KY
Chiu
D005260:Female; D006801:Humans; D008297:Male; D008670:Metals; D008875:Middle Aged; D012189:Retrospective Studies; D015607:Stents; D016896:Treatment Outcome; D014517:Ureteral Obstruction / Q000532:radiotherapy / Q000628:therapy*
D008670:Metals