Overview
Multi-center, randomized, double-blind, placebo-controlled, 12 weeks trial investigating the effects of a nine-strain synbiotic (Vivatlac Synbiotikum) on the gut microbiota of IBS patients
Description
The study design is a multi-centre, randomized, double-blind, placebo-controlled clinical trial in patients diagnosed with Irritable Bowel Syndrome (IBS). Diagnosis of IBS is performed with the World Gastroenterology Organisation's IBS questionnaire for health care providers. Assessment of the severity of IBS is done by using the IBS Severity Scoring System (IBS-SSS). IBS patients with moderate to severe IBS will be included in the study (IBS-SSS ≥ 175). A four-week treatment-free screening phase is used to evaluate the patients' IBS symptoms and stool characteristics using a patient diary.
The screening phase is followed by treatment with one capsule per day of a nine-strain synbiotic (Vivatlac® Synbiotikum) or with an identical-looking placebo for twelve weeks.
Each capsule of Vivatlac® Synbiotikum contains a total of 4.5 x 10\^9 colony-forming units (CFU) of nine different probiotic bacteria. Probiotic bacteria strains and their CFU amount per capsule are: Lactococcus lactis Ll-23, 9.00 x 10\^8 CFU; Lactobacillus helveticus SP 27, 9.00 x 10\^8 CFU; Bifidobacterium longum Bl-05, 6.75 x 10\^8 CFU; Bifidobacterium longum ES-1, 4.50 x 10\^8 CFU; Lacticaseibacillus rhamnosus Lr-32, 4.50 x 10\^8 CFU; Streptococcus thermophiles St-21, 4.50 x 10\^8 CFU; Lacticaseibacillus casei Lc-11, 2.25 x 10\^8 CFU; Lactiplantibacillus plantarum Lp-115, 2.25 x 10\^8 CFU; Bifidobacterium bifidum Bb-02, 2.25 x 10\^8 CFU. In addition, each capsule contains 68 mg of fructooligosaccharides (FOS).
Treatment effects on severity of IBS symptoms is assessed by using the IBS-Severity Scoring System (IBS-SSS), before the start of treatment and after 4, 8, and 12 weeks of treatment. Changes of IBS severity is assessed by using the IBS-Global Improvement Scale (IBS-GIS), before the start of treatment and after 4, 8, and 12 weeks of treatment. Patients are assessed for IBS adequate relief by using the IBS-Adequate Relief scale (IBS-AR), after 4, 8, and 12 weeks of treatment. Stool form characteristics is assessed with the Bristol Stool Form Scale (BSFS), at the start of the screening phase, at the start of treatment, and after 4, 8, and 12 weeks of treatment.
Stool samples are taken from all patients before the start of treatment and after 12 weeks of treatment. Fecal samples will be analyzed for gut microbiota profiles using 16S rRNA sequencing (taxonomic identification of bacterial genera) and/or nanopore shotgun sequencing (species-level identification). The presence of gut inflammation will be assessed by measuring fecal calprotectin as a biomarker for gut inflammation.
Eligibility
Inclusion Criteria:
- diagnosed for Irritable Bowel Syndrome using the IBS questionnaire for Health Care Providers of the World Global Gastroenterology Organization
- IBS severity assessed with the IBS-Severity Scoring System (IBS-SSS) being ≥ 175 points (indicating medium or severe IBS).
Exclusion Criteria:
- patients currently taking products containing probiotics or have taken this kind of products during the last 3 months
- patients currently taking antibiotics or have taken antibiotics during the last 3 months
- patients having a concurrent severe illness (malignancies, uncontrolled hypertension or diabetes, hepatic, renal or cardiac dysfunctions, serious neurological disorders, psychosis, respiratory disorders such as asthma or COPD, hyper- or hypothyroidism
- patients having chronic bowel disorders other than IBS, including inflammatory bowel disease, gastroenteritis, stomach and duodenal cancer, celiac disease
- patient being tested positive for presence of Clostridioides difficile
- patient being pregnant, lactating, or planning to become pregnant during the next 3 months
- patient being diagnosed to have a lactose intolerance
- patients using motility drugs or dietary fiber supplements withing 2 weeks before study start
- patient taking anti-coagulant medication
- patients have participated in another clinical trial within the last three months