Evaluation of the effect of Bernoulli maneuver on operative time during mini-percutaneous nephrolithotomy: A prospective randomized study
Purpose: To evaluate the effect of ‘Bernoulli maneuver’ (bringing the access sheath to horizontal plane) on operative time and stone free rates in patients undergoing mini-percutaneous nephrolithotomy (PCNL). Materials and Methods: All consecutive patients with a solitary kidney stone undergoing a...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Korean Urological Association
2017-05-01
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| Series: | Investigative and Clinical Urology |
| Subjects: | |
| Online Access: | https://www.icurology.org/Synapse/Data/PDFData/2020ICU/icu-58-179.pdf |
| Summary: | Purpose: To evaluate the effect of ‘Bernoulli maneuver’ (bringing the access sheath to horizontal plane) on operative time and
stone free rates in patients undergoing mini-percutaneous nephrolithotomy (PCNL).
Materials and Methods: All consecutive patients with a solitary kidney stone undergoing a mini-PCNL between 2015 and 2016
were included into this study. Patients were randomized either to standard prone or control (C) group patients or to tilted prone
with ‘Bernoulli maneuver’ group (B) patients. Pre-, intra-, and postoperative characteristics of these 2 groups were recorded and
analyzed.
Results: A total of 67 patients were included in the study. Of these, 40 patients were randomized to group C and 27 to group B. The
mean (95% confidence limits) stone size (mm) in group C and B was 14 (13, 15) and 13 (11, 14), respectively (p=0.26). Nephroscopy
time was shorter in Bernoulli group (35 minutes vs. 23 minutes, p=1.5∙10-5, and Bayes factor BF 10=2,340, and Cohen standardized
effect size d st=1.2). The difference made it up 12 minutes (with 95% confidence interval from 8 to 18 minutes). There were no statistically
significant differences between groups regarding white blood cell, creatinine level and stone-free status defined by computed
tomography on the first postoperative day.
Conclusions: In our study the ‘Bernoulli maneuver’ led to a shorter nephroscopy time in mini-PCNL. This maneuver can significantly
reduce nephroscopy time and save significant amount of operative time, especially in tertiary referral centers with high-volume
mini-PCNL procedures. |
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| ISSN: | 2466-0493 2466-054X |