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Chinese Journal of Clinicians(Electronic Edition) ›› 2022, Vol. 16 ›› Issue (07): 630-635. doi: 10.3877/cma.j.issn.1674-0785.2022.07.006

• Pelvic Floor Disorders·Clinical Research • Previous Articles     Next Articles

Clinical significance of variation of rectoanal inhibitory reflex after laparoscopic intersphincteric resection for ultralow rectal cancer

Yujuan Zhao1, Guangzuan Zhuo2, Yong Zhao2, Feifan Liu3, Bin Zhang2, Jun Zhu2, Shuhui Yin2, Ke Zhao2, Jianhua Ding2,()   

  1. 1. Jinzhou Medical University Rocket Force Characteristic Medical Center Postgraduate Training Base, Jinzhou 121001, China; Department of Colorectal Surgery, PLA Rocket Force Characteristics Medical Center, Beijing 100088, China
    2. Department of Colorectal Surgery, PLA Rocket Force Characteristics Medical Center, Beijing 100088, China
    3. Jinzhou Medical University Rocket Force Characteristic Medical Center Postgraduate Training Base, Jinzhou 121001, China
  • Received:2022-03-08 Online:2022-07-15 Published:2022-10-08
  • Contact: Jianhua Ding

Abstract:

Objective

To investigate the variation of rectoanal inhibitory reflex (RAIR) after laparoscopic intersphincteric resection (Lap-ISR) for ultralow rectal cancer and its correlation with anorectal function.

Methods

Between June 2016 and June 2020, 59 patients undergoing Lap-ISR for ultralow rectal cancer were enrolled. The variation of RAIR before the index operation, before ileostomy closure, and at 3~6 months and 12 months following ileostomy closure were analyzed. Anorectal function was evaluated by the LARS score and Wexner incontinence score at 12 months after ileostomy closure.

Results

The rates of presence of RAIR before the index operation, before ileostomy closure, and at 3~6 months and 12 months following stoma closure were 95% (56/59), 34% (20/59), 46% (27/59), and 61% (36/59), respectively. The elicited volume of RAIR was significantly increased at 12 months after ileostomy closure than that at baseline (30 ml vs 20 ml, P=0.004), but its duration (7 s vs 10 s, P>0.05) and amplitude (34.8% vs 38.5%, P>0.05) did not differ significantly. At 12 months after ileostomy closure, both the LARS score (27 points vs 34 points, P=0.006) and Wexner incontinence score (6 points vs 12 points, P=0.001) were significantly lower in the RAIR-present group than in the RAIR-absent group.

Conclusion

The RAIR is abolished in the majority of patients after Lap-ISR, but a time-dependent recovery could be observed. The presence of RAIR correlates with better continence.

Key words: Rectoanal inhibitory reflex, Intersphicteric resection, Ultralow rectal cancer, Low anterior resection syndrome

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