Factors associated with increased duration of endoscopic submucosal dissection for rectal tumors: a 22-year retrospective analysis

Abstract

Colorectal endoscopic submucosal dissection (ESD) is widely used in several countries. However, it is associated with technical difficulties. Rectal ESD is considered an intermediate step in colorectal ESD training. Nevertheless, some rectal lesions require a longer procedure time than usual, and the reason for the prolonged time taken for these specific lesions remains unclear. Therefore, this study aimed to clarify the factors associated with prolonged rectal ESD. In total, 483 rectal lesions resected using ESD from February 1998 to June 2021 were investigated. Prolonged ESD procedure time was defined as the time from the first submucosal injection to lesion removal exceeding 120 minutes, whereas other procedures were defined as average ESD procedure time. Clinicopathologic and endoscopic findings were compared between the 2 groups using univariate and multivariate analyses. One hundred forty-four lesions were resected using a prolonged ESD procedure time of 202.9 ± 92.3 minutes, whereas 339 lesions were resected using an average ESD procedure time of 77.8 ± 29.4 minutes. Multivariate analysis revealed that tumors involving the dentate line (P= .026), resection size≥50mm (P< .001), invasion depth≥T1b (P= .006), and circumferential range≥2/3 (P= .001) were independent risk factors for prolonged-duration ESDs, regardless of whether the procedure was performed by an expert or not. The results of the present study suggest that the location of a lesion involving the dentate line, resection size≥50mm, circumferential range≥2/3, and invasion depth≥T1b are the independent risk factors for prolonged ESD procedure time.