A Retrospective Observational Study for Prediction of Stone Free Status after Single-session of Retrograde Intrarenal Surgery for Renal StonesCorrespondence Address :
Associate Professor, Department of Urology, Institute of Nephrourology, Victoria
Hospital Campus, K R Market, Bengaluru, Karnataka, India.
Introduction: Retrograde Intrarenal Surgery (RIRS) is a preferred minimal invasive treatment modality for renal stones with advantages of being effective and having lower morbidity rates.
Aim: To predict the Stone Free Rate (SFR) after RIRS with lower pole and non-lower pole stones.
Materials and Methods: The records of 85 consecutive patients who underwent unilateral RIRS from September 2016 to July 2019 were retrospectively analysed. The studied parameters included patient demographics, stone characteristics (size, volume, and attenuation, Lower Pole Infundibulopelvic Angle (LP IPA) and operative time, presence of preoperative Double-J Stent (DJS) and Stone Free Status (SFS). Standard statistical tests were applied with level of significance as p<0.05.
Results: Overall success rate was 83.5% (71 cases) while 14 cases had Residual Stones (RS) at 1 month. The mean age of the patients was 41.07±12.25 years. The mean operative time was 68.85±22.3 minutes. Mean stone size and stone volume were higher in the RS group compared to SF (Stone free) group, 15.07±1.5 mm vs. 12.28±1.6 mm, 1187±145 mm3 vs.680.67±289 mm3 respectively (p<0.001; p<0.001). In RS group, 93% (13) cases had IPA <45°, while 80% cases with IPA >45° were stone free. Patients with non-lower pole stones has SFR 2.8 times compared to LP stones (p<0.001). On linear regression analysis, only LP IPA and LP stone location predicts SFS after RIRS.
Conclusion: Retrograde Intrarenal Surgery (RIRS) is effective procedure for renal stones. Stone size, stone volume, Lower Pole (LP) stone location and LP IPA effectively predict SFR. However, LP IPA and LP stone location are the most significant predictor of SFS, after single session RIRS for solitary renal stone.
Infundibulopelvic angle, Lower pole, Stone location
Date of Submission: Aug 31, 2020
Date of Peer Review: Nov 11, 2020
Date of Acceptance: Jan 01, 2021
Date of Publishing: Mar 01, 2021
• Financial or Other Competing Interests: No
• Was Ethics Committee Approval obtained for this study? Yes
• Was informed consent obtained from the subjects involved in the study? NA
• For any images presented appropriate consent has been obtained from the subjects. NA
PLAGIARISM CHECKING METHODS:
• Plagiarism X-checker: Sep 09, 2020
• Manual Googling: Jan 01, 2021
• iThenticate Software: Jan 20, 2021 (9%)
ETYMOLOGY: Author Origin
- Emerging Sources Citation Index (Web of Science, thomsonreuters)
- Index Copernicus ICV 2017: 134.54
- Academic Search Complete Database
- Directory of Open Access Journals (DOAJ)
- Google Scholar
- HINARI Access to Research in Health Programme
- Indian Science Abstracts (ISA)
- Journal seek Database
- Popline (reproductive health literature)