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Electrolyte-free gel immersion endoscopic submucosal dissection of gastric lesions
Gel immersion endoscopy was developed to secure the visual field during ongoing gastrointestinal bleeding using the viscous rehydration supplement “OS-1 jelly” (Otsuka Pharmaceutical Factory, Tokushima, Japan) . However, this includes electrolytes and needs replacement with gas or pure water before cauterization using monopolar devices to avoid electrical dispersion . A new, dedicated electrolyte-free gel (Viscoclear; Otsuka Pharmaceutical Factory) allows effective coagulation within the gel , enabling usage during endoscopic submucosal dissection (ESD).
With the emergence of new strategies to conquer difficult ESD, the water (or saline) immersion technique  and pocket-creation method have become popular . Inside the “pocket” during intraprocedural bleeding, gel immersion endoscopy easily secures the visual field with a small amount of gel .
We present two cases of ESD using gel immersion endoscopy ([Video 1]). In the first case with intraprocedural bleeding, we injected electrolyte-free gel via the accessory channel through the BioShield irrigator (US Endoscopy, Mentor, Ohio, USA) to secure the visual field. The bleeding point was identified and coagulated with hemostatic forceps within the gel ([Fig. 1]).
Video 1 Gastric gel immersion in endoscopic submucosal dissection with a new, dedicated electrolyte-free gel.
In the second case, we demonstrate the combination of gel and saline immersion ESD. Saline immersion ESD is reportedly advantageous because of buoyancy; however, rapid reduction of visualization due to minor bleeding, trapped gas within the hood, or inefficient coagulation due to electrical dispersion can be challenging . Gel immersion ESD maintains a clear visual field, especially in cases with the lesion on the lower side of gravity, where dirty water and blood collect easily. The viscosity of the gel prevents the direct flow of gas bubbles into the tip of the hood, and we can easily remove them by injecting a small amount of additional gel ([Fig. 2]).
Gel immersion ESD has the advantages of obtaining sufficient traction by buoyancy, maintaining a clear visual field regardless of lesion location, and enabling precision coagulation for hemostasis.
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This section has its own submission
15 October 2021 (online)
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