As preparation for endoscopy, oral dimethicone (Gascon drops; Kissei Pharmaceutical Co., Ltd, Matsumoto, Japan), 1 g of sodium bicarbonate, and 8% lidocaine pump spray (8% Xylocaine Pump Spray; AstraZeneca K.K., Osaka, Japan) were administered. In this study, the endoscopy system used was categorized as having normal, small-diameter, and magnifying endoscopes. Normal endoscopes were
GIF-H290,
GIF-H260,
GIF-Q260, and
GIF-260J (Olympus Optical, Tokyo, Japan). Small-diameter endoscopes were GIF-XP290N,
GIF-XP260N (Olympus Optical),
EG-L580NW7, EG-580NW2,
EG-530NW, and EG-530N (Fujifilm Co, Tokyo, Japan). Magnifying endoscopes were
GIF-H290Z and
GIF-H260Z (Olympus Optical). Every examination of the stomach was routinely performed with white light imaging, besides, indigo carmine chromoendoscopy [18 (
link)] or image-enhanced endoscopy (narrow-band imaging [19 (
link)–21 (
link)], flexible spectral imaging color enhancement [22 (
link)], blue laser imaging [23 (
link)], and linked color imaging [24 (
link), 25 (
link)]) was available to augment detection. Some patients underwent midazolam sedation during the procedure upon their request. In addition, topical administration of l-menthol (Minclea; Nihon Pharmaceutical Co., Ltd, Tokyo, Japan) was available for the reduction of gastric peristalsis [26 (
link)].
Oka K., Iwai N., Okuda T., Hara T., Inada Y., Tsuji T., Komaki T., Sakagami J., Naito Y., Kagawa K, & Itoh Y. (2021). Clinical Features of False-Negative Early Gastric Cancers: A Retrospective Study of Endoscopic Submucosal Dissection Cases. Gastroenterology Research and Practice, 2021, 6635704.