The effect of faecal microbiota transplantation on abdominal pain, stool frequency, and stool form in patients with moderate-to-severe irritable bowel syndrome: results from a randomised, double-blind, placebo-controlled study

Abstract

Background

Irritable bowel syndrome (IBS) is associated with intestinal dysbiosis. Therefore, faecal microbiota transplantation (FMT) has been hypothesised to have a positive effect in patients with IBS. In this study, we analysed previously unexamined data from our randomised, double-blind, placebo-controlled study (trial registration number NCT02788071). The objective was to evaluate the effect of FMT on abdominal pain, stool frequency, and stool form.

Method

The study included 52 adult patients with moderate-to-severe IBS assigned randomly to treatment with FMT capsules or placebo capsules (1:1) for 12 days. The patients were followed for a total of six months, during which they kept a daily symptom diary tracking their abdominal pain on a scale from 0–10 and their bowel movements using the Bristol Stool Form Scale (BSFS). Diary data were not collected before treatment start.

Results

A statistically significant improvement in stool frequency was found in the FMT group from during treatment to post-treatment and 1 month. No statistically significant differences were found between groups at any time during the study for any of abdominal pain, stool frequency, and stool form (as measured by weighted stool score).

Conclusion

In this analysis of results from a randomised, double-blind, placebo-controlled study, we found no clinically beneficial effect of FMT on abdominal pain, stool frequency, or stool form. However, since the current literature on the potential role of FMT in treating IBS shows conflicting results, further studies are required. To assess treatment efficacy, we recommend future studies to include daily symptom diaries both before and after treatment intervention.

Keywords:

• Faecal microbiota transplantation
• irritable bowel syndrome
• Bristol Stool Form Scale
• abdominal pain
• stool frequency

Acknowledgements

The authors thank MD Maria Rubin for sharing her method to assess stool form.

Author contributions

SIH, SG, AHC, LHH and AMP designed the original research project; SIH and AHC performed the clinical research; AMAM wrote the paper; SIH and AMP supervised the paper; AMAM and TK performed the statistical analysis; All authors read, commented on, and approved the final paper.

Disclosure statement

All the authors declare that they have no competing interests.

Additional information

Funding

The study was financed by grants from the private foundations: Wedell-Wedellsborgs Fund, Toyota-Fonden Denmark, Danish Colitis-Crohn’s Associations Research Fund, Tømmerhandler Johannes Fogs Fond, Villy Safft Nielsens Fond,Villum Foundation Block Stipend, MicroHealth (Innovation Fund Denmark) and co-financed by Aleris-Hamlet Research and Development Fund and Department of Gastroenterology Hvidovre University Hospital.