Masunaga, Teppei

写真a

Affiliation

School of Medicine, Cancer Center (Shinanomachi)

Position

Instructor

External Links
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Academic Background 【 Display / hide 】

  • 2009
    -
    2015

    Kanazawa Medical University, 医学部, 医学科

    University, Graduated

  • 2020
    -
    2024

    Keio University, 医学部, 医学研究科

    Graduate School, Graduated, Doctoral course

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Academic Degrees 【 Display / hide 】

  • 博士, Keio University, Coursework, 2024

    Novel quantitative assessment indicators for efficiency and precision of endoscopic submucosal dissection in animal training models by analyzing an electrical surgical unit

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Papers 【 Display / hide 】

  • Automatic water irrigation synchronized with the electrosurgical unit: Bubble-free underwater endoscopic submucosal dissection

    Sasaki M., Masunaga T., Miyazaki K., Nakajima K., Yahagi N., Kato M.

    Endoscopy (Endoscopy)  56 ( S 01 ) E468 - E469 2024.12

  • Novel therapeutic endoscope facilitates endoscopic submucosal dissection of adenocarcinoma at the esophagogastric junction

    Morioka K., Takatori Y., Masunaga T., Yahagi N., Kanai T., Kato M.

    Endoscopy (Endoscopy)  56   E470 - E471 2024.06

    ISSN  0013726X

  • Resectability of Small Duodenal Tumors: A Randomized Controlled Trial Comparing Underwater Endoscopic Mucosal Resection and Cold Snare Polypectomy

    Miyazaki K., Nakayama A., Sasaki M., Minezaki D., Morioka K., Iwata K., Masunaga T., Kubosawa Y., Mizutani M., Hayashi Y., Kiguchi Y., Akimoto T., Takatori Y., Kawasaki S., Matsuura N., Sujino T., Takabayashi K., Yamanoi K., Mori K., Kanai T., Yahagi N., Kato M.

    American Journal of Gastroenterology (American Journal of Gastroenterology)  119 ( 5 ) 856 - 863 2024.05

    ISSN  00029270

    　View Summary

    INTRODUCTION:Underwater endoscopic mucosal resection (UEMR) and cold snare polypectomy (CSP) are novel endoscopic procedures for superficial nonampullary duodenal epithelial tumors (SNADET). However, consensus on how to use both procedures appropriately has not been established. In this study, we evaluated treatment outcomes of both procedures, including resectability.METHODS:In this single-center randomized controlled study conducted between January 2020 and June 2022, patients with SNADET ≤12 mm were randomly allocated to UEMR and CSP groups. The primary end point was sufficient vertical R0 resection (SVR0), which was defined as R0 resection including a sufficient submucosal layer. We compared treatment outcomes including SVR0 rate between groups.RESULTS:The SVR0 rate was significantly higher in the UEMR group than in the CSP group (65.6% vs 41.5%, P = 0.01). By contrast, the R0 resection rate was not significantly different between study groups (70.3% vs 61.5%, P = 0.29). The submucosal layer thickness was significantly greater in the UEMR group than in the CSP group (median 546 [range, 309-833] m vs 69 [0-295] m, P < 0.01). CSP had a shorter total procedure time (median 12 [range, 8-16] min vs 1 [1-3] min, P < 0.01) and fewer total bleeding events (9.4% vs 1.5%, P = 0.06).DISCUSSION:UEMR has superior vertical resectability compared with CSP, but CSP has a shorter procedure time and fewer bleeding events. Although CSP is preferable for most small SNADET, UEMR should be selected for lesions that cannot be definitively diagnosed as mucosal low-grade neoplasias.

  • Layered closure by endoscopic hand suturing involving the muscle layer for large defect after gastric endoscopic submucosal dissection

    Masunaga T., Yahagi N., Kato M.

    Digestive Endoscopy (Digestive Endoscopy)  36 ( 3 ) 384 - 385 2024.03

    ISSN  09155635

  • Novel quantitative assessment indicators for efficiency and precision of endoscopic submucosal dissection in animal training models by analyzing an electrical surgical unit

    Masunaga T., Kato M., Sasaki M., Iwata K., Miyazaki K., Kubosawa Y., Mizutani M., Takatori Y., Matsuura N., Nakayama A., Takabayashi K., Yahagi N.

    Digestive Endoscopy (Digestive Endoscopy)  36 ( 1 ) 19 - 27 2024.01

    ISSN  09155635

    　View Summary

    Objectives: Although endoscopic submucosal dissection (ESD) training is important, quantitative assessments have not been established. This study aimed to explore a novel quantitative assessment system by analyzing an electrical surgical unit (ESU). Methods: This was an ex vivo study. Step one: to identify the novel efficiency indicators, 20 endoscopists performed one ESD each, and we analyzed correlations between their resection speed and electrical status. Step two: to identify the novel precision indicators, three experts and three novices performed one ESD each, and we compared the stability of the electrical status. Step three: three novices in step two performed 19 additional ESDs, and we analyzed the learning curve using novel indicators. Results: Step one: the percentage of total activation time (AT) of ESU in the procedure time (β coefficient, 0.80; P < 0.01) and AT required for submucosal dissection (β coefficient, −0.57; P < 0.01) were significantly correlated with the resection speed. Step two: coefficient of variation of the AT per one pulse (0.16 [range, 0.13–0.17] vs. 0.26 [range, 0.20–0.41], P = 0.049) and coefficient of variation of the peak electric power per pulse during mucosal incision (0.14 [range, 0.080–0.15] vs. 0.25 [range, 0.24–0.28], P = 0.049) were significantly lower in the experts than in the novices. Regarding the learning curve, the percentage of total AT of ESU in the procedure time and AT required for submucosal dissection had a trend of improvement. Conclusion: Novel indicators identified by analyzing ESU enable quantitative assessment for endoscopist's skill.

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Reviews, Commentaries, etc. 【 Display / hide 】

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

  • 鈍的剥離が内視鏡的粘膜下層剥離術後の創傷治癒および狭窄の発生に与える影響

    2025.04
    -
    2027.03

    若手研究, Principal investigator

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Awards 【 Display / hide 】

  • GIE Outstanding Manuscript Award

    2024

    Type of Award： Honored in official journal of a scientific society, scientific journal

  • The 15th JSGE-UEG Rising Star

    2024

    Type of Award： Award from international society, conference, symposium, etc.

  • 日本消化器関連学会（JDDW2023）The Best Presenter Award in International Session

    2023

    Type of Award： Award from Japanese society, conference, symposium, etc.

  • 慶應義塾大学大学院医学研究科 慶應医学大塚普門・房子フェローシップ

    2023

    Type of Award： Keio commendation etc.

  • 日本消化器関連学会（JDDW2021） 若手奨励賞

    2021

    Type of Award： Award from Japanese society, conference, symposium, etc.

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