“Prophylactic” transanal irrigation (TAI) to prevent symptoms of low anterior resection syndrome (LARS) after rectal resection: results at 12-month follow-up of a controlled randomized multicenter trial

Low anterior resection syndrome (LARS) is associated with a severe negative impact on patients’ quality of life (QOL). In a recent prospective randomized controlled trial (RCT) by our group, early (“prophylactic”) use of transanal irrigation (TAI) following rectal resection for rectal cancer was shown to improve symptoms associated with LARS significantly compared with a group under supportive therapy (ST) within 1 and 3 months following closure of the protective ileostomy. The aim of the present study was to evaluate the outcome after 12 months when patients had the option to choose between the two therapeutic options and/or modify the regimen of TAI (volume and time).

In the RCT, 18 patients had been allocated to start with TAI following ileostomy closure, while 19 patients remained on ST only. Once the 3-month follow-up had been completed patients could choose between TAI or ST, respectively, and were invited for follow-up after 12 months. The maximum number of bowel movements during the day and the Wexner and LARS score as well as physical (PC) and mental (MC) component of the SF-36 questionnaire were evaluated. Furthermore, in patients who had changed their treatment arm, reasons for this decision were reported.

Six patients were lost to follow-up (all in the ST group). One patient from the ST group started with TAI due to problems associated with LARS, bringing the total number of TAI patients to 19. Nine patients from the previous TAI arm changed to ST due to the long duration of the emptying process (n: 8) or pain during TAI (n: 1), respectively. After 12 months, the median volume of water used for irrigation was 600 ml (range 200–1000 ml). The ten patients who continued with TAI patients showed a lower number of defecation episodes per daytime (TAI median 3; 1–6, ST median 5; 2–10, p: 0.018) and per night (TAI median 0; 0–1, ST median 1; 0–5, p: 0.004) compared to the ST group. Although the LARS score was lower in patients who used TAI after 12 months (TAI median 18; 9–32, ST median 30; 3–39), this failed to reach the level of significance (p: 0.063). Evaluation of the Wexner score and the 36-item Short Form Health Survey as well as comparison of patients who remained on TAI (n: 9) versus those who had stopped TAI after 3 months (n: 9) failed to find any statistically significant difference between TAI and ST.

This follow-up study revealed that a considerable number of patients decided to stop TAI within 12 months. However, the number of bowel movements during the day were still lower when TAI was used than when patients had ST only.

Randomized trial.

DRKS00011752, https://​apps.​who.​int/​trialsearch/​.