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Usefulness of sheath lifting after saline injection technique for colorectal endoscopic submucosal dissection
Although colorectal endoscopic submucosal dissection (ESD) enables high en bloc resection regardless of tumor size, it is still a challenging procedure because of its technical difficulties, relatively long procedure time, and high rates of perforation   . One of the most important things to prevent perforation during colonic ESDs is to maintain the cutting direction of the ESD knife parallel to the muscle layer to avoid dissecting into this layer. In clinical practice, however, the angulated, narrow colon and peristalsis can make it difficult to keep the cutting direction parallel to the muscle layer. The “sheath lifting after saline injection” technique involves using the sheath of the ESD knife to lift the submucosal layer away from the muscle layer just after injecting normal saline into the submucosal layer ([Fig. 1]). This technique has three steps. First, normal saline is injected into the submucosal layer via ESD knives that have a water jet function, such as the FlushKnife BT-S (Fujifilm Co., Tokyo, Japan) . Second, the sheath of the ESD knife is inserted into the submucosal layer and the length of the ESD knife is adjusted . Third, the submucosal layer is lifted with the sheath and then cut towards the larger space of the colonic lumen. [Video 1] shows a colonic ESD case using this technique. After mucosal incision, we found that the cutting direction of the ESD knife was toward the muscle layer because the muscle layer seemed to be going upward. To overcome this, we performed the sheath lifting after saline injection technique ([Fig. 2]).
Video 1 Colonic endoscopic submucosal dissection using the sheath lifting after saline injection technique.
The sheath lifting after saline injection technique is effective whenever endoscopists are unable to keep the cutting direction of the ESD knife parallel to the muscle layer when making the mucosal flap or during dissection of the submucosal layer.
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11 September 2020 (online)
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