Browsing by Author "Bas, Okan"

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    Asymptomatic Lower Pole Small Renal Stones: Shock Wave Lithotripsy, Flexible Ureteroscopy, or Observation? A Prospective Randomized Trial
    (2015) Sener, Nevzat Can; Bas, Okan; Sener, Emine; Zengin, Kursad; Ozturk, Ufuk; Altunkol, Adem; Evliyaoglu, Yalcin; 25440816; HKN-9151-2023
    OBJECTIVE To present the outcomes of flexible ureteroscopy (F-URS), shock wave lithotripsy (SWL), and observation in the management of asymptomatic lower calyceal stones. METHODS A total of 150 patients with asymptomatic lower calyceal stones were randomized into F-URS (group 1), SWL (group 2), and observation (group 3) groups. The main criteria for patient enrollment were having asymptomatic single lower pole stones <1 cm. RESULTS In F-URS, the mean stone-free rate was 92% (46 of 50). The mean number of sessions for the SWL group was 1.48 +/- 0.65. Stone-free rate was 90% (45 of 50). In the observation group, patients were followed up for a mean of 21.02 +/- 3.65 months. Three stones passed spontaneously without any symptoms. Pain developed in 3 patients during follow-up, and 2 of them passed a stone and responded to analgesics without further treatment. Complication rates for groups 1 and 2 were similar, but group 2 had higher Clavien grades. CONCLUSION For asymptomatic small-sized lower calyceal stones, SWL and F-URS are established treatment modalities. However, with low auxiliary treatment rates, observation may be an option for the management of nonsymptomatic small-sized lower pole kidney stones. (C) 2015 Elsevier Inc.
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    Treatment of Moderate Sized Renal Pelvis Calculi: Stone Clearance Time Comparison of Extracorporeal Shock Wave Lithotripsy and Retrograde Intrarenal Surgery
    (2016) Ercil, Hakan; Alma, Ergun; Bas, Okan; Sener, Nevzat Can; Vuruskan, Ediz; Kuyucu, Faruk; Unal, Umut; Goren, Mehmet Resit; Evliyaoglu, Yalcin; https://orcid.org/0000-0002-2001-1386; 26945652; Y-6143-2019
    Purpose: To compare the stone clearance times in patients undergoing extracorporeal shock wave lithotripsy (SWL) or retrograde intrarenal surgery (RIRS) for single radiopaque renal pelvis stones 10-20 mm in size. The results of this study may guide urologists and patients and aid in selecting the optimal preoperative treatment. Materials and Methods: Between January 2013 and February 2015, we conducted a retrospective study and collected data from 333 patients treated with SWL (n = 172) or RIRS (n = 161). We included successfully treated patients with a single radiopaque renal pelvis stone 10-20 mm in size to calculate stone clearance times. Results: The average stone size for the SWL group was 14.62 +/- 2.58 mm and 14.91 +/- 2.92 mm for the RIRS group. The mean Hounsfield unit (HU) of the patients was 585.40 +/- 158.39 HU in the SWL group and 567.74 +/- 186.85 HU in the RIRS group. Following full fragmentation, the mean stone clearance time was 26.55 +/- 9.71 days in the SWL group and 11.59 +/- 7.01 days in the RIRS group (P <.001). Conclusion: One of the most overlooked parameters in urinary stone treatments is stone clearance. We believe this study will shed light for those who aim to conduct larger randomized prospective studies.