Condition category
Date applied
Date assigned
Last edited
Retrospectively registered
Overall trial status
Recruitment status
No longer recruiting
Publication status
Results overdue

Plain English Summary

Background and study aims
Endoscopy (colonoscopy) is the gold standard investigation for abnormalities of the gastrointestinal tract, allowing for direct visualisation, taking tissue samples and, where required, therapeutic intervention. It is well recognised that the quality of bowel preparation affects the outcome of colonoscopy. Inadequate bowel preparation can lead to diseases being missed or for the procedure needing to be repeated. Up to 20% of colonoscopies have inadequate bowel preparation. Repeat procedures can be stressful for patients and delay diagnosis. It is therefore vital to optimise bowel preparation for colonoscopy. To improve the safety and quality of bowel preparation, some units employ a team specialised in pre-colonoscopy assessment but this is a costly option. According to the office of national statistics, 86% of households in Great Britain had internet access in 2015. A reliable internet-based educational video may be an effective method to educate patients about bowel preparation leading improved adequacy. This study will assess whether an educational video explaining how to take bowel preparation leads to a more effectively cleared bowel.

Who can participate?
Adults who speak English and require a colonoscopy to assess for bowel disease, and have access to the internet or a DVD player

What does the study involve?
The study will assess whether an educational video regarding bowel preparation for colonoscopy improves its effectiveness. Half the participants will receive access to the video, whilst the other half will not. Who receives access will be determined by chance. The effectiveness of the bowel preparation for the colonoscopy will then be recorded and compared between the two groups.

What are the possible benefits and risks of participating?
A more effectively cleared bowel allows a more thorough examination of the colon. Therefore, if the video is successful in improving bowel preparation then participants who have access to it are less likely to have abnormalities missed. They are also less likely to require a repeat procedure due to poor preparation. The possible risks involved are the standard risks of a colonoscopy examination; however, watching the video will not increase these risks.

Where is the study run from?
Nottingham University Hospital and 5 other hospitals in the UK

When is the study starting and how long is it expected to run for?
June 2018 to June 2019

Who is funding the study?
The Midland Gastroenterological Society (UK)

Who is the main contact?
Dr Thomas Archer

Trial website

Contact information



Primary contact

Dr Thomas Archer


Contact details

Endoscopy department
Northern General Hospital
Herries Road
S5 7AU
United Kingdom

Additional identifiers

EudraCT number

2018-003248-21 number

Protocol/serial number


Study information

Scientific title

Can an educational video improve the adequacy of bowel preparation for patients under going their first colonoscopy compared to standard written instructions alone?


Study hypothesis

An educational video will improve bowel preparation for colonoscopy.

Ethics approval

Nottingham Research Ethics Committee 1, 11/12/2018, ref: 18/NW/0768

Study design

Interventional randomised controlled trial

Primary study design


Secondary study design

Randomised controlled trial

Trial setting


Trial type


Patient information sheet

Not available in web format, please use contact details to request a participant information sheet


Colonoscopy bowel preparation


Patients will be randomised to viewing an educational video which explains what a colonoscopy is and how to take bowel preparation, alongside standard written instructions or to standard written instructions alone.

Participants will be randomised using simple randomisation to two groups, the control group and the intervention group. The control group will receive the standard written instructions provided prior to colonoscopy explaining how to take the bowel preparation solution. The intervention group will receive the standard written information and will also receive access to an educational video with the same content but presented in a different media format.

Participants will be asked to review this information prior to taking the bowel preparation solution. They will complete questionnaires prior to and subsequent to the endoscopy to collect data on patient demographics, anxiety, satisfaction and comfort. Once they have completed the questionnaires after the endoscopy their involvement in the study will be completed.

Intervention type



Drug names

Primary outcome measure

Adequacy of bowel preparation, assessed using the Boston Bowel Prep Score (BBPS) at the time of endoscopy

Secondary outcome measures

1. Mean BBPS between the groups, assessed using the Boston Bowel Prep Score as in the primary outcome measure
2. Number of patients with excellent (BBPS >7) and adequate (BBPS 5-7), as per primary outcome measure
3. Adenoma detection rate, recorded in the endoscopy report at the time of endoscopy
4. Number of adenomas, recorded in the endoscopy report at the time of endoscopy
5. Number of polyps, recorded in the endoscopy report at the time of endoscopy
6. Caecal intubation rate (whether the endoscopy is completed), assessed at the time of endoscopy
7. Insertion time (time taken to reach the caecum), assessed in minutes and seconds at the time of endoscopy
8. Patient comfort scores, assessed at the end of the endoscopy using the following:
8.1. Nurse-patient comfort score
8.2. Visual analogue scale, completed by patient
9. Patient acceptability of the video, assessed using a visual analogue scale prior to the colonoscopy whilst the patient awaits the examination
10. Effect of the video on patients anxiety regarding the procedure, assessed using a visual analogue scale prior to the colonoscopy whilst the patient awaits the examination
11. Overall effect on patients satisfaction of the experience, assessed using a visual analogue scale prior to the colonoscopy whilst the patient awaits the examination

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

1. Aged 18 years or older
2. Requiring colonoscopy for investigation of their gastrointestinal tract
3. General fitness deemed sufficient to undertake colonoscopy
4. Able and willing to provide informed consent
5. Access to either a DVD player or the internet
6. Not previously had a colonoscopy
7. Able to attend clinic on a weekday with either a morning or afternoon appointment

Participant type

Healthy volunteer

Age group




Target number of participants


Participant exclusion criteria

1. Intolerant to endoscopy
2. Not clinically fit for standard endoscopy as judged by their clinical team
3. Known Crohn's disease or colonic strictures
4. Lacking the visual acuity to clearly read text and watch and clearly interpret a TV screen or computer monitor
5. Unable to understand English to a low intermediate level
6. Unable to take the first line bowel preparation Moviprep

Recruitment start date


Recruitment end date



Countries of recruitment

United Kingdom

Trial participating centre

Northern General Hospital
Herries Road
S5 7AU
United Kingdom

Trial participating centre

Queens Medical Centre
Derby Road
United Kingdom

Trial participating centre

Royal Derby Hospital
DE22 3NE
United Kingdom

Trial participating centre

Chesterfield Royal Hospital
S44 5BL
United Kingdom

Trial participating centre

Greetwell Road
United Kingdom

Trial participating centre

Sherwood Forest Hospital
Mansfield Road
NG17 4JL
United Kingdom

Sponsor information


Nottingham University Hospital

Sponsor details

Derby Road
United Kingdom

Sponsor type

Hospital/treatment centre



Funder type


Funder name

Midland Gastroenterological Society

Alternative name(s)

Funding Body Type

Funding Body Subtype


Results and Publications

Publication and dissemination plan

Results of the study will be published in a medical journal in 2019

IPD sharing statement:
The datasets generated during and/or analysed during the current study will be available upon request from Dr Thomas Archer (email The data will be available when the analyses has been published. The data will be available for 5 years and will be anonymised.

Intention to publish date


Participant level data

Available on request

Basic results (scientific)

Publication list

Publication citations

Additional files

Editorial Notes