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Kidney displacement does not alter the success and complication rates, but is associated with longer fluoroscopy times during supine PCNL. In the current study, parameters in preoperative non-contrast computerized tomography (NCCT) associated with kidney displacement were identified. We recommend surgeons evaluate and take into account these parameters during preoperative planning to establish better outcomes and diminish fluoroscopy times.

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Objectives In this study, we aimed to evaluate the effect of HPL on different parameters by different centers and urologists.While doing this, we evaluated different parameters by comparing HPL(High Power laser) and LPL(Low power laser). Methods This is an observational, retrospective, comparative, multicentric study of prospectively organised database. A total of 217 patients who underwent RIRS for kidney stones smaller than 2 cm in three different centers were included in the study. The patients were divided into two groups; LPL used (Group1, n:121 patients) and HPL used (Group2, n:96). Propensity score matching was done in the data analysis part. After matching, a total of 192 patients, 96 patients in both groups, were evaluated. Results There was no difference between the groups regarding age, gender, stone side, and stone location. The stone-free rate on the first day was 80.3% in Group 1, it was 78.1% in Group 2 (p=0.9). In the third month, it was 90.7% in Group 1 and 87.5% in Group 2 (p:0.7).Hospitalization duration was significantly higher in Group 1. (2.35±2.27 days vs. 1.42±1.10 days; p<0.001).The operation duration was 88.70±29.72 minutes in Group1 and 66.17±41.02 minutes in Group2 (p<0.001). The fluoroscopy time (FT) was 90.73±4.79 seconds in Group 1 and 50.78±5.64 seconds in Group 2 (p<0.001).Complications according to Clavien Classification, were similar between the groups(p>0.05) (Table 2). Conclusion According to our study similar SFR and complication rates were found with HPL and LPL. In addition, patients who used HPL had lower operation time, hospital stay, and fluoroscopy time than the LPL group.Although high-power lasers are expensive in terms of cost, they affect many parameters and strengthen the hand of urologists thanks to the wide energy and frequency range they offer.

Objectives In this study, it is aimed to identify the rate of successful placement of a guidewire down through the ureter during PNL and to compare the outcomes of different locations of guidewires in the collecting system following renal puncture in terms of success and complications rates. Patients and methods Data of 1052 patients who underwent miniPNL in our institution between January 2014 and November 2020 were analysed. Patients were divided into three groups. Group I consisted of patients with the guidewire coiled within the punctured calyx, group II consisted of patients with the guidewire reaching the renal pelvis and group III consisted of patients with the guidewire passed down through the ureter. The groups were compared for successful tract creation and complication rates. Results There were 303 (28.8%) patients in group I, 330 (31.4%) patients in group II and 419 (39.8%) patients in group III. Successful tract dilation at the first attempt was established in 298 (94.7%) patients in group I, 328 (99.4%) patients in group II and in all of the 419 (100%) patients in group III. Successful tract creation was established in a second attempt in all of the patients failed in the first attempt. The groups were similar for stone‐free and complication rates. Conclusions Placement of guidewire down through the ureter could not be established in more than 60% of the cases. Location of guidewire prior to dilation did not affect the outcomes. Therefore, we suggest to proceed with tract creation even when the guidewire coils within the punctured calyx.

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