Evidence map›Paper›PMID 41176748›Full record

ArticleInternational urology and nephrology2026

Intrarenal pressure during the flexible and navigable suction ureteral access sheath-assisted retrograde intrarenal surgery: a two-center study.

Sotaro Kayano, Takafumi Yanagisawa, Ken Shibata, Eriko Nishi, Yuji Yata, Keiichiro Miyajima, Naoki Fujisawa, Yuka Yasuda, Shigetoshi Maiya, Tetsuo Shinozaki and 3 more

Abstract readMulticenter Study
PubMed Publisher
In one paragraph

Article in International urology and nephrology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.

0numbers the graph read from it
0cells of the map it votes in
9citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

9 citing papers in PubMed.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

13 authors.

Sotaro KayanoDepartment of Urology, Ota Memorial Hospital, Gunma, Japan.
Takafumi YanagisawaDepartment of Urology, The Jikei University School of Medicine, 3-19-18, Nishi-Shimbashi, Minato-Ku, Tokyo, 105-8471, Japan. t.yanagisawa.jikei@gmail.com.
Ken ShibataDepartment of Urology, Ota Memorial Hospital, Gunma, Japan.
Eriko NishiDepartment of Urology, Ota Memorial Hospital, Gunma, Japan.
Yuji YataDepartment of Urology, The Jikei University School of Medicine, 3-19-18, Nishi-Shimbashi, Minato-Ku, Tokyo, 105-8471, Japan.
Keiichiro MiyajimaDepartment of Urology, The Jikei University School of Medicine, 3-19-18, Nishi-Shimbashi, Minato-Ku, Tokyo, 105-8471, Japan.
Naoki FujisawaDepartment of Urology, IMS FUJIMI General Hospital, Saitama, Japan.
Yuka YasudaDepartment of Urology, IMS FUJIMI General Hospital, Saitama, Japan.
Shigetoshi MaiyaDepartment of Urology, IMS FUJIMI General Hospital, Saitama, Japan.
Tetsuo ShinozakiDepartment of Urology, IMS FUJIMI General Hospital, Saitama, Japan.
Steffi Kar Kei YuenS.H. Ho Urology Centre, Department of Surgery, The Chinese University of Hong Kong, Hong Kong, China.
Tatsuya SimomuraDepartment of Urology, The Jikei University School of Medicine, 3-19-18, Nishi-Shimbashi, Minato-Ku, Tokyo, 105-8471, Japan.
Takahiro KimuraDepartment of Urology, The Jikei University School of Medicine, 3-19-18, Nishi-Shimbashi, Minato-Ku, Tokyo, 105-8471, Japan.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeTo evaluate intrarenal pressure (IRP) during flexible and navigable suction ureteral access sheath (FANS)-assisted retrograde intrarenal surgery (RIRS), and to identify clinical factors influencing increased IRP.

methodsThis retrospective study included 30 consecutive patients who underwent FANS-assisted RIRS using the LithoVue™ Elite ureteroscope (Boston Scientific, Marlborough, USA) at two Japanese centers between October 2024 and May 2025. Two types of 12/14 Fr FANS, Clear Petra™ (Wellead Medical, Guangzhou, China) and NOVAGATE™ (Dornier MedTech, Zhejiang, China) were utilized. IRP was evaluated during the lithotripsy phase. Various IRP metrics were analyzed, including the median, maximum, time-weighted mean, percentage of time above thresholds (> 20, > 30, and > 40 mmHg), and area under the curve (AUC). Factors related to % time > 30 mmHg were assessed, and temporal changes in IRP were compared across four equal surgical intervals.

resultsThe median % time > 20, > 30, and > 40 mmHg were 22.7% (IQR 5-52.1), 3.31% (0.8-13.5), and 0.01% (0-3.3), respectively. % time > 30 mmHg was significantly greater when the FANS tip was positioned at the ureteropelvic junction than within the renal pelvis (10.4 vs 1.2%, p = 0.02) and in staghorn cases (11.3 vs 1.1%, p = 0.01). No significant differences were observed across the four surgical intervals (p = 0.85). No postoperative febrile urinary tract infections occurred. There were no cases of postoperative febrile urinary tract infection.

conclusionsFANS-assisted RIRS allowed real-time monitoring and overall maintenance of low intrarenal pressure. Staghorn calculi and sheath tip position were associated with pressure elevation. The generalizability is limited as only 12/14 Fr sheaths were included.

Indexed as

KidneyKidney CalculiUreteroscopyAdultAgedEquipment DesignFemaleHumansMaleMiddle AgedPressureRetrospective StudiesSuctionUreterUreteroscopesFlexible and navigable suction ureteral access sheathIntrarenal pressureKidney stoneRetrograde intrarenal surgeryUrolithiasis

Identifiers

PMID41176748

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.