Treatment of Irritable bowel syndrome with diarrhoea using titrated ondansetron
| ISRCTN | ISRCTN17508514 |
|---|---|
| DOI | https://doi.org/10.1186/ISRCTN17508514 |
| ClinicalTrials.gov (NCT) | Nil known |
| Clinical Trials Information System (CTIS) | 2017-000533-31 |
| Protocol serial number | 33831 |
| Sponsor | Nottingham University Hospitals NHS Trust |
| Funder | National Institute for Health Research |
- Submission date
- 11/09/2017
- Registration date
- 02/10/2017
- Last edited
- 18/11/2024
- Recruitment status
- No longer recruiting
- Overall study status
- Completed
- Condition category
- Digestive System
Plain English summary of protocol
Background and study aims
Irritable bowel syndrome (IBS) with diarrhoea (IBS-D) is a common condition characterised by recurrent abdominal pain with frequent, loose stools passed with urgency. Such patients may have an excess of serotonin (5-hydroxytryptamine [5-HT)) in their intestine which stimulates movement through the bowel (transit) and secretion. Ondansetron is a drug which blocks the 5-HT receptor, which is used to treat nausea, and has an excellent safety record. A pilot study has known that that Ondansetron slows transit and improves IBS-D symptoms so there is a need to find out how this works. Bowel contractions can be measured using a new high resolution system and bowel relaxation by assessing pressure during rectal distension with a balloon to determine whether these changes are related to improved symptoms. Total bile acid concentrations and the amount of pancreatic enzyme can be measured, tryptase, in the stools as these may sensitise the rectum causing urgency. The response to ondansetron may depend upon genetic factors so the variation in the gene controlling the rate of 5HT production needs to be assessed. The aim of this study is to treat patients with Ondansetron or a placebo (a dummy tablet without any effect) and compare the change in symptoms.
Who can participate?
Adults aged 18 and older with IBS
What does the study involve?
Participants are allocated to one of two groups. Those in the first group receive the medication Ondansetron taken by mouth for 12 weeks. Those in the second group receive a placebo (a dummy tablet without any effect). Participants are contacted by researchers to discuss any symptoms. Participants are measured in the 12th week to see the effect of the drug compared to placebo.
What are the possible benefits and risks of participating?
Participants may benefit from a reduction in their symptoms if ondansetron is effective. There are risks such as constipation. Ondansetron is currently licenced for the management of nausea and vomiting post-operatively or following treatment with cancer. In this setting it is used in a much higher dose (32mg) and is administered intravenously. Within its current licenced use, ondansetron has been associated with prolongation of the QT interval. This effect is not anticipated in the TRITON study giving that patients will be administered a much lower dose (4-8mg) orally. However as safeguard, those with a prolonged QT or taking drugs known to prolong this will be excluded from the study. Ischaemic colitis has been associated with other, similar drugs and therefore those with Ischaemic colitis are excluded from the study. Additionally, if participants develop rectal bleeding whilst on study, they will be recommended to have a sigmoidoscopy. It is likely that bleeding will stem from the anal canal associated with trauma from frequent defecation.
Where is the study run from?
University of Leeds (UK)
When is the study starting and how long is it expected to run for?
February 2017 to August 2020
Who is funding the study?
National Institute for Health Research (UK)
Who is the main contact?
Miss Lorna Barnard
triton@leeds.ac.uk
Added 07/02/2019:
Twitter account for trial: @IBSTriton
Contact information
Public
Clinical Trials Research Unit
Leeds Institute of Clinical Trials Research
University of Leeds
Leeds
LS2 9JT
United Kingdom
| Phone | +44 1133 430555 |
|---|---|
| triton@leeds.ac.uk |
Study information
| Primary study design | Interventional |
|---|---|
| Study design | Randomised; Interventional; Design type: Treatment, Drug |
| Secondary study design | Randomised controlled trial |
| Study type | Participant information sheet |
| Scientific title | TReatment of Irritable bowel syndrome using Titrated ONdansetron Trial |
| Study acronym | TRITON |
| Study objectives | The overall aim of the study is to investigate the effectiveness and mechanism of action of ondansetron, a 5HT3RA, in patients with IBS-D, as assessed by stool frequency, consistency, urgency and abdominal pain. |
| Ethics approval(s) | Approved 07/11/2017, Yorkshire & The Humber - Leeds West Research Ethics Committee, ref: 17/YH/0262 |
| Health condition(s) or problem(s) studied | Irritable bowel syndrome |
| Intervention | Participation attend an initial visit where they are registered for the study. Patients are asked to complete a two-week daily paper diary recording: 1. Stool frequency 2. Stool consistency for each stool using the Bristol stool form scale (BSFS) 3. Worst abdominal pain experienced that day (on a scale of 0-100, where 0 is no pain and 100 is worst imaginable pain) 4. Worst bowel movement urgency (on a scale of 0-100, where 0 is no urgency and 100 is worst imaginable urgency) 5. If they have used loperamide that day. The completed pages of the patient diaries will be collected at each visit by the local study team. This information is used to confirm eligibility at the randomisation visit. In addition the CTRU will send each patient two text messages to the mobile phone number provided every day. The first will ask if they have passed a stool which has had a consistency 6 or 7 on the BSFS and the patient will need to text back 1 for yes and 0 for no. The second will ask what their worst abdominal pain score was that day, from a scale of 0-100 (where 0 is no pain and 100 is worst imaginable pain) and the patient will need to text back the score from 0-100. The study nurse will discuss this process with the patients and if it is highlighted that this will be a problem, the patient will complete only the paper diary. The mobile number provided will be verified prior to use. The patient may withdraw from receiving text messages upon request. Completed diaries will be brought to visit two Eligibility confirmation. Participants attend a third visit where they are randomised. Participants are randomised on a 1:1 basis to receive either ondansetron or placebo. Participants are randomised based on stratification factors to ensure the treatment groups are well-balanced. Details of which are required at randomisation include the site name, colonic monometry assessment carried out and barostat assessment carried out. This is a double blinded trial and therefore neither the patient nor those responsible for their care (treating team and research team) will know the allocation. Patients are given the opportunity to find out what treatment arm they are allocated to at the end of the study period. Upon randomisation, participants are allocated either 4mg Ondansetron or placebo and instructed to start their treatment on one capsule a day. Depending on the response, participants are asked to increase the dose in 4 mg steps every two days to a maximum of 8 mg three times a day. Treatment lasts for 12 weeks and the follow up visit occurs four weeks from the last dose of trial treatment. Patients are asked to continue to record the following information until visit 6 (Follow-Up visit) Daily: 1. Stool frequency 2. Stool consistency for each stool - using the Bristol stool form scale (BSFS); 3. Worst abdominal pain experienced that day - on a scale of 0-100, where 0 is no pain and 100 is worst imaginable pain. 4. Worst bowel movement urgency - on a scale of 0-100, where 0 is no urgency and 100 is worst imaginable urgency. 5. Number of trial medication capsules taken. 6. If they have used loperamide that day. Weekly they record if they feel they have had satisfactory relief from their symptoms that week. The completed pages of the patient diaries will be collected in at each visit by the local study team. Text Messaging Patients will continue to receive two text messages to their mobile phone every day for the next 6 weeks unless they have withdrawn from this aspect. The first will ask if they have passed a stool which has had a consistency 6 or 7 on the BSFS and the patient will need to text back yes or no. The second will ask what their worst abdominal pain score was that day, from a scale of 0-100 (where 0 is no pain and 100 is worst imaginable pain) and the patient will need to text back the score from 0-100. During the first two week patients will be contacted every 2 days the site team to discuss symptoms. The dose will then be titrated as required. |
| Intervention type | Other |
| Primary outcome measure(s) |
Current primary outcome measure as of 07/09/2021: |
| Key secondary outcome measure(s) |
Current secondary outcome measures as of 07/09/2021: |
| Completion date | 31/08/2020 |
Eligibility
| Participant type(s) | Patient |
|---|---|
| Age group | Adult |
| Lower age limit | 18 Years |
| Sex | All |
| Target sample size at registration | 400 |
| Total final enrolment | 80 |
| Key inclusion criteria | 1. Written (signed and dated) informed consent 2. Considered fit for study participation 3. Meeting Rome IV criteria (Appendix 1) for IBS-D 4. Aged ≥ 18 years 5. Undergone standardised workup to exclude the following alternative diagnoses 5.1. Microscopic colitis (colonoscopy or flexible sigmoidoscopy) 5.2. Bile acid diarrhoea (SeHCAT results of > 10% or C4 results of <19 ng/ml or failed 1 week trial of a bile acid binding agent [colestyramine 4g t.d.s., colesevelam 625mg t.d.s. or equivalent]) within previous 5 years) (Note: Cholecystectomy will not be an exclusion criterion if bile acid diarrhoea has been excluded. Patients with SeHCAT values of 5-10% will be eligible if they fail to respond to a 1 week trial of bile acid binding agent (see above)) 5.3. Lactose malabsorption 5.4. Coeliac disease (tTG or duodenal biopsy) 6. Patients of childbearing potential or with partners of childbearing potential must agree to use methods of medically acceptable forms of contraception during the study and for 90 days after completion of study drug, (e.g. implants, injectable, combined oral contraceptives, barrier methods, true abstinence (when this is in line with the preferred and usual lifestyle of the patient) or vasectomised partners). 7. For women of childbearing potential, a negative pregnancy test should be performed within 72 hours of confirmation of eligibility 8. Weekly average worst pain score during 2-week screening period meets inclusion criteria 9. Stool consistency during 2-week screening period meets inclusion criteria * Inclusion criteria 8 & 9 will be assessed after the patient has completed the 14-day daily stool and pain diary and returned the results at visit 2 |
| Key exclusion criteria | 1. Gastrectomy 2. Intestinal resection 3. Other known organic GI diseases (e.g. Inflammatory bowel disease – Crohns disease, Ulcerative colitis, coeliac disease) 4. Unable or unwilling to stop restricted medication including regular loperamide, antispasmodics (e.g. buscopan, mebeverine, peppermint oil, alverine citrate), eluxadoline, tricyclic antidepressant doses >30mg/day or other drugs likely in the opinion of the investigator to alter bowel habit. These medicines should be discontinued for a 7 day washout period prior to registration. Intermittent loperamide will be permitted but only as rescue medication 5. QTc interval ≥450msec for men and ≥470msec for women. Assessed within the last 3 months by a 12-lead ECG 6. Previous chronic use of Ondansetron or contraindications to it (rare as per BNF) 7. Pulse, Blood pressure, FBC or LFTs outside the normal ranges according to the site’s local definition of normal. Assessed within the last 3 months. Note: Minor rises in ALT (<2 x upper limit of normal) will be acceptable but the patient’s GP will be informed if they remain elevated at end of the study 8. Women who are pregnant or breastfeeding 9. Currently participating or who have been in an IMP trial in the previous three months where the use of the IMP may cause issues with the assessment of causality in this study 10. Currently taking SSRIs or tricyclic antidepressants (unless at a stable dose for at least 3 months and with no plan to change the dose during the study) 11. Currently taking and unwilling or unable to stop any of the prohibited medications. (Prohibited medications – Apomorphine and Tramadol which interact with ondansetron Caution should be taken with patients on QT prolonging drugs and cardio toxic drugs. These patients should be reviewed by the PI to determine if they are suitable for the study. 12. Stool consistency during 2-week screening period does not meet inclusion criteria |
| Date of first enrolment | 01/01/2018 |
| Date of final enrolment | 11/05/2020 |
Locations
Countries of recruitment
- United Kingdom
- England
- Scotland
Study participating centres
Derby Road
Nottingham
NG7 2UH
United Kingdom
Beckett Street
West Yorkshire
Leeds
LS9 7TF
United Kingdom
Trust Offices
White Chapel
London
E1 1BB
United Kingdom
Praed Street
London
W2 1NY
United Kingdom
London
NW1 2PG
United Kingdom
Southmoor Road
Wythenshawe
Manchester
M23 9LT
United Kingdom
Stott Lane
Manchester
M6 8HD
United Kingdom
Hollyhurst Road
Darlington Country
Durham
DL3 6HX
United Kingdom
Dudley Road
West Midlands
Birmingham
B18 7QH
United Kingdom
South Yorkshire
Barnsley
S75 2EP
United Kingdom
Princes Road
Staffordshire
Stoke-on-Trent
ST4 7LN
United Kingdom
Edinburgh
EH4 2XU
United Kingdom
Glossop Road
Sheffield
S10 2JF
United Kingdom
Marton Road
Middlesbrough
TS4 3BW
United Kingdom
Results and Publications
| Individual participant data (IPD) Intention to share | Yes |
|---|---|
| IPD sharing plan summary | Available on request |
| IPD sharing plan | The datasets generated during and/or analysed during the current study are/will be available upon request from CTRU-DataAccess@leeds.ac.uk. Data will only be shared for participants who have given consent to use their data for secondary research. Requests to access trial data should be made to CTRU-DataAccess@leeds.ac.uk in the first instance. No data will be released before an appropriate agreement is in place setting out the conditions of release. The agreement will govern data retention requirements, which will usually stipulate that data recipients must delete their copy of the data at the end of the planned project. |
Study outputs
| Output type | Details | Date created | Date added | Peer reviewed? | Patient-facing? |
|---|---|---|---|---|---|
| Results article | 03/03/2023 | 06/03/2023 | Yes | No | |
| Results article | 01/10/2023 | 18/11/2024 | Yes | No | |
| Protocol article | protocol | 20/08/2019 | 21/08/2019 | Yes | No |
| Basic results | version 2.0 | 07/09/2021 | 07/09/2021 | No | No |
| HRA research summary | 28/06/2023 | No | No | ||
| Participant information sheet | Participant information sheet | 11/11/2025 | 11/11/2025 | No | Yes |
| Study website | Study website | 11/11/2025 | 11/11/2025 | No | Yes |
Additional files
- ISRCTN17508514_BasicResults_V2.0_07Sep21.docx
- Basic results
Editorial Notes
18/11/2024: Publication reference added.
06/03/2023: Publication reference added.
09/09/2021: IPD sharing statement added.
07/09/2021: The following changes were made to the trial record:
1. The recruitment end date was changed from 20/03/2020 to 11/05/2020.
2. The overall trial end date was changed from 30/09/2020 to 31/08/2020.
3. The intention to publish date was changed from 30/09/2021 to 10/09/2021.
4. The primary and secondary outcome measures were updated.
5. The basic results of this trial have been uploaded as an additional file.
11/09/2020: The recruitment end date was changed from 29/02/2020 to 20/03/2020. The total final enrolment number was added.
30/01/2020: The recruitment end date was changed from 31/12/2019 to 29/02/2020.
20/12/2019: The recruitment end date was changed from 31/10/2019 to 31/12/2019.
21/08/2019: Publication reference added.
09/07/2019: The following changes were made to the trial record:
1. The study contact was changed.
2. Ethics approval details added.
3. The inclusion and exclusion criteria have been amended to prevent recruitment of participants who should not be eligible.
4. Trial participating centres were added.
03/04/2019: The condition has been changed from "Specialty: Gastroenterology, Primary sub-specialty: Gastroenterology; UKCRC code/ Disease: Oral and Gastrointestinal/ Other diseases of intestines" to "Irritable bowel syndrome" following a request from the NIHR.
07/02/2019: A trial website was added. Also the plain English summary was updated to include a Twitter account.
26/10/2017: Internal review.
