Results
Five hundred and seventy-two patients were included in our study. The patients’ demographics and characteristics are presented in Table 1. The overall stone-free rate was 82.5%. There were 10 patients (1.7%) who met the criteria for SIRS; for the remainder of the patients, there were no infectious complications documented.
In SIRS group; mean stone volume, LOS, surgical time, and the rate of recurrent UTI history were significant. No statistical difference was observed in terms of the duration between PBUC and SULL between the normal groups and the SIRS groups (Table 2).
In relation to the time interval between PBUC and post-SULL SIRS, no statistically remarkable correlation was found (Table 3). To evaluate the cut off duration of surgical time for SIRS, the ROC curve analysis was performed. The cut off value for operation time in predicting post-SULL SIRS was 47.5 minutes (The AUC: 0.877; sensitivity 100 %; specificity 78.1 %; 95 % CI: 0.835-0.920).
This study demonstrates the risk factors for SIRS postoperatively that were found significant in univariable analysis as presented in Table 3. In univariable analysis; stone volume, surgical period, LOS, and the history of recurrent UTI were detected as determinants of SIRS.
As we avoided using stone diameter and volume simultaneously in multivariable analysis, considering these variables strongly correlated with each other, this may lead to multicollinearity issues. LOS was another factor that was not studied in the multivariable analysis. In multivariable analysis, stone volume, operation time and the history of recurrent UTI were revealed as significant variables. (Table 3).