Optimization of insufflation and pressure control in third-space endoscopy

Abstract

Background

Third-space endoscopy requires a delicate and accurate insufflation technique to secure the endoscopic visualization and maintain the working space. However, optimal third-space insufflation parameters have yet to be determined. The aim of this study was to assess: (1) the diversity of endoluminal third-space pressure by manual insufflation, and (2) the performance of the insufflation settings for third-space endoscopy.

Methods

A submucosal tunnel was created in the upper posterior wall of the porcine stomach. Using two-channel esophagogastroduodenoscopy, one channel was used for insufflation and the other was used for pressure measurement. Experiment 1 Endoluminal submucosal tunnel pressure was measured in a 10-cm submucosal tunnel of a single porcine. Six board-certified endoscopists in turn maintained what they considered sufficient exposure under manual insufflation. Experiment 2 Endoluminal submucosal tunnel pressure and number of insufflations were measured using the pressure-regulated insufflation device; the differences in the submucosal tunnel length (long: 10-cm, short: 4-cm) and the insufflation route diameter (large: 3.8-mm, small: 2.2-mm) were compared.

Results

Experiment 1 The endoluminal submucosal tunnel pressure profiles during third-space endoscopy varied between endoscopists. Experiment 2 Longer submucosal tunnels and larger insufflation route diameters lead to stable endoluminal submucosal tunnel pressure. The gap with the preset pressure of the insufflator and endoluminal pressure narrowed, and the required number of insufflations decreased with longer tunnel length and larger route diameter.

Conclusions

The pressure dynamics in third-space endoscopy differed among endoscopists. Longer submucosal tunnels and larger insufflation route diameters lead to stable endoluminal submucosal tunnel pressure.

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Funding

This research was partly funded by Research Grant from Japan Consortium for Advanced Surgical Endoscopy (J-CASE 2018).

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Affiliations

Authors

Contributions

NU designed the study and U wrote the initial draft of the manuscript. NU also contributed to the interpretation of the data and to the critical revision of the manuscript for important intellectual content. All the other authors (M, YY, T, Y, S, T, M, T, K, MY, E, D) contributed to data collection and interpretation and critical review of the manuscript. All the authors have read and approved the final version of the manuscript and have agreed to the accountability of all aspects of the study, ensuring that any queries related to the accuracy or integrity of any part of the work are answerable.

Corresponding author

Correspondence to Kiyokazu Nakajima.

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Disclosures

Drs. Yuki Ushimaru, Noriko Matsuura, Yasushi Yamasaki, Yoji Takeuchi, Kotaro Yamashita, Takuro Saito, Koji Tanaka, Tomoki Makino, Tsuyoshi Takahashi, Yukinori Kurokawa, Makoto Yamasaki, Hidetoshi Eguchi, Yuichiro Doki, and Kiyokazu Nakajima have no conflicts of interest or financial ties to disclose.

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All procedures in this study were performed in accordance with the ethical standards of the responsible committee on institutional animal experimentation.

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Ushimaru, Y., Matsuura, N., Yamasaki, Y. et al. Optimization of insufflation and pressure control in third-space endoscopy. Surg Endosc (2021). https://doi.org/10.1007/s00464-021-08319-y

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Keywords

  • Third-space
  • Endoscopy
  • Insufflation
  • Submucosal tunnel
  • Gastrointestinal tract