Distinct patterns of short-chain fatty acids during flare in patients with ulcerative colitis under treatment with mesalamine or a herbal combination of myrrh, chamomile flowers, and coffee charcoal: secondary analysis of a randomized controlled trial.

Objectives: Short-chain fatty acids are involved in the regulation of the gut immune system. In ulcerative colitis, short-chain fatty acids are often reduced, especially during flare. This study evaluated exploratively the pattern of butyrate and total short-chain fatty acids in patients with ulcerative colitis during flare treated either with mesalamine or a herbal preparation consisting of myrrh, chamomile flowers, and coffee charcoal which showed promising results in maintaining remission in a randomized double-blind, double-dummy, controlled clinical trial (EudraCT-Number 2007-007928-18). Methods: Patients were treated with the herbal preparation or mesalamine. Clinical activity was monitored by Clinical Colitis Activity Index. Using gas chromatography, we analyzed fecal samples of 38 patients who experienced a flare during treatment. Results: Paired t-test showed a significant decline of total short-chain fatty acids [M before = 66.12, SD = 39.59; M after = 29.83, SD = 15.05; 95% bootstrap confidence interval (20.53-55.30); P = 0.01) and of butyrate [M before 11.35, SD = 7.56; M after = 6.50, SD = 3.55; 95% bootstrap confidence interval (2.06-8.11); P = 0.02] in the event of a flare for patients treated with mesalamine but not for patients treated with the herbal preparation. Conclusion: Patients who received the herbal preparation did not show a significant decline of total short-chain fatty acids in the event of a flare. Since a decline of short-chain fatty acids might lead to unfavorable health impairments, a combination of the two treatments should be further investigated.