Comparison of anal dilatation versus no dilatation with a standardized dilator in reducing pain after hemorrhoidectomy: a randomized control trial

BACKGROUND: Post-operative pain is the main problem of hemorrhoidectomy. An adequate pain management can promote early mobilization, fast recovery, and reduce hospitalization costs. This study aimed to investigate the role of preoperative anal dilatation using a standardized anal dilator in reducing post-operative pain. METHOD: This study was conducted using randomized prospective trial with a total of 40 subjects, who were divided into 2 groups. The first group received preoperative anal dilatation using a 33 mm anal dilator for 20 min, while the second group did not. The post-operative anal pain, edema, bleeding, and incontinence were observed in the first, second, and seventh day. RESULT: The post-operative pain was significantly lower in the preoperative anal dilatation group for all days of observation (p < 0.05). The difference of post-operative bleeding and edema between groups were not significant. Fecal incontinence was initially significantly higher in the preoperative anal dilatation group, but the difference was insignificant at the seventh day (p = 0.500). CONCLUSION: Preoperative anal dilatation significantly reduced post-operative pain. The side effect of fecal incontinence was only temporary until the seventh day after surgery. Trial Registration This trial was registered on Thai Clinical Trials Registry (TCTR) with TCTR identification number TCTR20220314002, on 14/03/2022 (retrospectively registered).