ArticleWorld journal of urology2025
Does the height of the irrigation fluid and irrigation method affect the intrarenal pressure using ureteroscopes with direct in-scope suction feature? An ex-vivo experimental study.
Article in World journal of urology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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16 authors.
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Abstract
purposeTo evaluate the effect of irrigation fluid height on intrarenal pressure (IRP) when using flexible ureteroscopes with direct in-scope suction (DISS) under different irrigation conditions. MATERIALS AND
methodsAn ex-vivo experimental study utilizing a 7.5Fr PU3033AH and 9.2Fr PU400A flexible ureteroscopes was performed with irrigation bags at heights of 60, 100, and 140 cm using gravity, manual pump and automated pump irrigation (40, 60, 80, and 100mmHg). The evaluated parameters included initial IRP, pressure decrease after 1 s of suctioning, time to collapse the pelvicalyceal system, and time to regain initial IRP.
resultsThe 9.2Fr DISS demonstrated higher flow rates in all settings compared to the 7.5Fr scope. Increasing irrigation height (60 cm to 140 cm) significantly enhanced flow rates with gravity irrigation for both scopes. The automated pump maintained consistent IRP regardless of irrigation height, while gravity and manual pump irrigation showed higher IRP with increased fluid height. The 9.2Fr scope generated higher baseline IRPs but demonstrated more efficient pressure reduction with when suction was applied.
conclusionsThe height of irrigation fluid significantly impacts flow rates and IRP during flexible ureteroscopy with DISS technology when using gravity and manual pump irrigation systems and this varies considerably with different diameter working channels. Automated pump irrigation maintains a consistent pressure regardless of fluid height. The 9.2Fr scope provides higher flow rates and more efficient suction capabilities, although it results in higher baseline intrarenal pressures.
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