A single-center prospective study on pain alleviation during peroral upper endoscopy with an ultrathin endoscope

Iwao Aya, Ryoji Ichijima, Tomomi Sugita, Masako Nakayama, Ayaka Takasu, Kanako Ogura, Takuji Gotoda, Hirofumi Kogure

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Background: The efficacy of transnasal endoscopy using an ultrathin endoscope has been reported in several studies. However, few studies regarding peroral endoscopy with ultrathin endoscopes with high resolution have been reported. This study investigates the pain alleviation of peroral endoscopy with an ultrathin endoscope. Methods: Patients with a history of peroral endoscopy using a conventional, normal-diameter scope with no sedation who underwent peroral esophagogastroduodenoscopy (EGD) using a thin scope between April-July 2022 were included in this study. After the procedure, the patients completed a questionnaire evaluating pain during the examination and willingness to repeat the procedure. The physicians were surveyed regarding their level of satisfaction. The primary endpoint was patient satisfaction, which corresponded to the rate of patients who rated the thin endoscope as more comfortable or somewhat more comfortable than the previously-used, conventional endoscope. Results: One hundred and forty-five patients were included in the analyses. Patient satisfaction was achieved in 86.2% (125/145) of patients. The median visual analog scale pain score was 3 (0–7) points in this study, which is significantly lower than the pain score after the previous endoscopy (5 (0–10) points; p < 0.001). In addition, 96% (24/25) of patients who underwent EGD by an expert and 95.8% (115/120) who underwent EGD by a non-expert were willing to repeat endoscopy using the thin scope (p = 0.69). Conclusion: Peroral endoscopy using a thin scope reduces patient pain regardless of the endoscopist’s experience.

Original languageEnglish
Article number325
JournalBMC Gastroenterology
Issue number1
Publication statusPublished - Dec 2023


  • Reduction of discomfort undergoing upper endoscopy
  • Transnasal ultrathin esophagogastroduodenoscopy)
  • Upper GI tract


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