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Article of the week: 1-week and 4-week stenting equally effective after pyeloplasty

Every week the Editor-in-Chief selects the Article of the Week from the current issue of BJUI. The abstract is reproduced below and you can click on the button to read the full article, which is freely available to all readers for at least 30 days from the time of this post.

In addition to the article itself, there is an accompanying editorial written by a prominent member of the urological community. This blog is intended to provoke comment and discussion and we invite you to use the comment tools at the bottom of each post to join the conversation.

If you only have time to read one article this week, it should be this one.

One- vs 4-week stent placement after laparoscopic and robot-assisted pyeloplasty: results of a prospective randomised single-centre study

H. Danuser, C. Germann, N. Pelzer, A. Rühle, P. Stucki and A. Mattei

Klinik für Urologie, Luzerner Kantonsspital, Lucerne, Switzerland


To determine whether 1-week stenting of the pelvi-ureteric anastomosis of laparoscopic or robot-assisted pyeloplasty is as effective as 4-week stenting, based on their respective success rates.


A total of 100 patients with pelvi-ureteric junction obstruction were treated by Anderson-Hynes pyeloplasty and the anastomosis was stented using a 6-F JJ catheter for either 1 week (1W series) or 4 weeks (4W series), based on a randomisation protocol. Postoperative follow-up was performed at 3 months using intravenous urography (IVU), at 6 months using diuretic renography and at 1, 3 and 5 years using ultrasonography. Statistical analysis was performed using a one-sided Z-test, Pearsons’s chi-squared test and a Wilcoxon rank sum test.


The primary outcome measure, success rate, which was defined as no obstruction on IVU and diuretic renography, was 100% in the 1W series and not inferior to the success rate of 98% in the 4W series (P = 0.006). The following secondary outcome measures were not significantly different between the 1W and the 4W series with regard to residual symptoms (10 vs 6%; P = 0.48), rate of complications (4 vs 6%; P = 0.65), need for synchronous robot-assisted pyelolithotomy (4 vs 8%; P = 0.47), improvement in split renal function (1 vs 0%; P = 0.59) and duration of surgery (200 vs 192 min; P = 0.87). Only length of hospital stay was significantly different; this was shorter in the 1W series (5 vs 6 days; P = 0.01).


Stenting of the pelvi-ureteric anastomosis after laparoscopic or robot-assisted pyeloplasty for 1 week is as effective as stenting for 4 weeks. Both procedures, laparoscopic or robot-assisted pyeloplasty have an excellent success rate.

1 reply
  1. Declan Murphy
    Declan Murphy says:

    What a nice study – my practice has just changed in an instant! Patients hate stents and I will be delighted to take stents out one week post-robotic pyeloplasty based on this nice work.

    Declan Murphy

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