Description

Study Design:

Prospective, randomized, open-label, controlled trial with two parallel arms.

Study Center:

Department of Urology, St. Luke's Clinical Hospital, St. Petersburg, Russia

Study Population:

All patients should not be prestented and should have no ureteral obstruction. 40 patients, divided into four equal groups of 20 people each:

Group I (standard DJ stent):

Group II (modified DJ stent)

Procedure for evaluation:

After surgery ( RIRS, ureteroscopy) reflux is assessed (gravity-filling cystogram). After stenting, the presence of post-stent reflux is assessed.

In the postoperative period, patients complete the USSQ (1st day, 7th day and before stent removal).

Statistics method:

The results are presented as the median and interquartile range (IQR) for continuous variables, and as frequencies (n with percentage %) for categorical variables. Statistical comparisons of all primary and secondary outcome measures between different treatment groups were conducted using the Mann-Whitney U test for continuous data. Meanwhile, categorical variables were analyzed using either Pearson's chi-square (χ²) test or Fisher's exact test, where appropriate. Thenthreshold for statistical significance was established at 5%, implying that a p-value less than 0.05 (p \< 0.05) was considered statistically significant for all tests performed.