Abstract
Introduction
Ureteral access sheath (UAS) and irrigation are used in flexible ureteroscopy (fURS). Both conventional UAS (cUAS) and vacuum-assisted UAS (vaUAS) are currently available. Irrigation increases the intrarenal pressure (IRP). Our objectives were to study the effects of various irrigation rates on IRP using different sizes of fURS in different sizes and functions of UAS.
Materials and methods
Ten freshly harvested porcine kidneys served as the study subjects. 11/13F and 12/14F cUAS and vaUAS with 2.8 mm and 3.2 mm fURS were experimented on in various scope/sheath combinations. 6F pressure monitor catheters were placed into upper, middle, and lower calyces. IRPs were recorded under different irrigation rates in cUAS and vaUAS, with either 150 or 300 mmHg aspiration pressures, and with air vent either open or closed.
Results
12/14F cUAS with 2.8 mm fURS could maintain IRPs below 35 mmHg with irrigation rates up to 200 cc/min. With 3.2 mm fURS, the rate dropped to 110–120 cc/min. With 12/14F vaUAS and vent closed, the IRP remained less than 5 mmHg at 200 cc/min irrigation for both fURS. For 11/13F cUAS, the < 35 mmHg threshold for 2.8 mm fURS was 80–90 cc/min; for 3.2 mm fURS, it was 30–40 cc/min. For 11/13F vaUAS with vent closed, IRPs remained < 5 mmHg at 200 cc/min irrigation for both scopes.
Conclusion
Both 12F cUAS and vaUAS can be used safely with 2.8 mm fURS up to 200 cc/min irrigation. With either a smaller sheath or a larger scope, vaUAS with vent closed can maintain IRP in a safe range up 200 cc/min irrigation. vaUAS with vent open performed marginally better than cUAS.
Similar content being viewed by others
Data availability
The data used to support the findings of this study are available from the corresponding author upon request.
References
Hinman F, Redewill FH (1926) Pyelovenous back flow[J]. JAMA 87:1287–1288
Boccafoschi C, Lugnani F (1985) Intra-renal reflux[J]. Urol Res 5(13):253–258
Jung HU, Frimodt-Moller PC, Osther PJ et al (2006) Pharmacological effect on pyeloureteric dynamics with a clinical perspective: a review of the literature[J]. Urol Res 34(6):341–350
Kukreja RA, Desai MR, Sabnis RB et al (2002) Fluid absorption during percutaneous nephrolithotomy: does it matter?[J]. J Endourol 16(4):221
Stenberg A, Bohman SO, Morsing P et al (1988) Back-leak of pelvic urine to the bloodstream[J]. Acta Physiol Scand 134(2):223–234
Wang D, Han Z, Bi Y et al (2022) Comparison of intrarenal pressure between convention and vacuum-assisted ureteral access sheath using an ex vivo porcine kidney model[J]. World J Urol 40(12):3055–3060
Auge BK, Pietrow PK, Preminger GM (2004) Ureteral access sheath provides protection against elevated intra-renal pressures generated during routine flexible ureteroscopic stone manipulation[J]. J Urol 171(Suppl 4):499
Cao Z, Yu W, Li W et al (2013) Acute kidney injuries induced by various irrigation pressures in rat models of mild and severe hydronephrosis[J]. Urology 82(6):1453–1459
Rehman J, Monga M, Landman J et al (2003) Characterization of intrapelvic pressure during ureteropyeloscopy with ureteral access sheaths[J]. Urology 61(4):713–718
Fung LC, Atala A (1998) Constant elevation in renal pelvic pressure induces an increase in urinary N-acetyl-beta-D-glucosaminidase in a nonobstructive porcine model [J]. J Urol 159(1):212–216
Yoshida T, Inoue T, Abe T et al (2018) Evaluation of intrapelvic pressure when using small-sized ureteral access sheaths of ≤10/12F in an ex vivo porcine kidney model[J]. J Endourol 32(12):1142–1147
Jung H, Osther PJ (2015) Intraluminal pressure profiles during flexible ureterorenoscopy[J]. Springerplus 4:373
Thomsen HS, Dorph S, Larsen S et al (1983) Intrarenal backflow and renal perfusion during increased intrapelvic pressure in excised porcine kidneys[J]. Acta Radiol Diagn (Stockh) 24(4):327–336
Wright A, Williams K, Somani B et al (2015) Intrarenal pressure and irrigation flow with commonly used ureteric access sheaths and instruments[J]. Central Eur J Urol 68(4):434–438
Wilson WT, Preminger GM (1990) Intrarenal pressures generated during flexible deflectable ureterorenoscopy[J]. J Endourol 4(2):135–141
Boddy SA, Nimmon CC, Jones S et al (1989) Irrigation and acute ureteric dilatation–as for ureteroscopy[J]. Br J Urol 63(1):11–13
Monga M, Bodie J, Ercole B (2004) Is there a role for small-diameter ureteral access sheaths? Impact on irrigant flow and intrapelvic pressures[J]. Urology 64(3):439–441
Schwalb DM, Eshghi M, David Ian M et al (1993) Morphological and physiological changes in the urinary tract associated with ureteral dilation and ureteropyeloscopy: an experimental study[J]. J Urol 149(6):1576–1585
Thomsen HS, Larsen S, Talner LB (1982) Pyelorenal backflow during retrograde pyelography in normal and ischemic porcine kidneys. A radiologic and pathoanatomic study[J]. Eur Urol 8(5):291–297
Noureldin YA, Kallidonis P, Ntasiotis P et al (2019) The effect of irrigation power and ureteral access sheath diameter on the maximal intra-pelvic pressure during ureteroscopy: in vivo experimental study in a live anesthetized pig [J]. J Endourol 33(9):725–729
Monga M, Best S, Venkatesh R et al (2004) Prospective randomized comparison of 2 ureteral access sheaths during flexible retrograde ureteroscopy [J]. J Urol 172(2):572–573
Fang L, Xie G, Zheng Z et al (2019) The effect of ratio of endoscope-sheath diameter on intrapelvic pressure during flexible ureteroscopic lasertripsy[J]. J Endourol 33(2):132–139
Caballero-Romeu JP, Galan-Llopis JA, Soria F et al (2018) Micro-ureteroscopy vs ureteroscopy: effects of miniaturization on renal vascularization and intrapelvic pressure [J]. World J Urol 36(5):811–817
Acknowledgements
We want to thank Professor Shaw P. Wan, MD. for his input and editing the English for this manuscript.
Funding
This work is funded by The Mobility Programme of National Natural Science Foundation of China, Grant NO.M-0299.
Author information
Authors and Affiliations
Corresponding authors
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
About this article
Cite this article
Guan, W., Liang, J., Wang, D. et al. The effect of irrigation rate on intrarenal pressure in an ex vivo porcine kidney model—preliminary study with different flexible ureteroscopes and ureteral access sheaths. World J Urol 41, 865–872 (2023). https://doi.org/10.1007/s00345-023-04295-1
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00345-023-04295-1