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Bowel preparation for colonoscopy: is diet restriction necessary?
Background: Bowel preparation is essential for quality colonoscopy. Although most bowel preparation regimens recommend dietary restriction for 24 to 48 hours before the procedure, the evidence for this is poor. Objectives: To establish whether dietary restriction during bowel preparation improves th...
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| Format: | Thesis |
| Language: | English |
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Division of General Surgery
2021
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| _version_ | 1867613282217492480 |
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| access_status_str | Open Access |
| author | Chang, Hung-Jou |
| author2 | Goldberg, Paul |
| author_browse | Chang, Hung-Jou Goldberg, Paul |
| author_facet | Goldberg, Paul Chang, Hung-Jou |
| author_sort | Chang, Hung-Jou |
| collection | Thesis |
| description | Background: Bowel preparation is essential for quality colonoscopy. Although most bowel preparation regimens recommend dietary restriction for 24 to 48 hours before the procedure, the evidence for this is poor. Objectives: To establish whether dietary restriction during bowel preparation improves the quality of bowel preparation. Methods: A prospective single blind, randomised controlled pilot study. The dietary restriction (DR) group was instructed not to ingest high fibre foods for 48 hours prior to the use of a polyethylene glycol (PEG) bowel preparation. The non-dietary restriction (NDR) group was not given any dietary modification, but received instructions for the use of the PEG-based preparation solution. On the day of colonoscopy, the quality of the bowel effluent was assessed, and additional preparation given as necessary. The primary endpoint was quality of bowel cleansing using the Harefield Cleansing Scale during colonoscopy. The secondary endpoint was the need for additional bowel preparation and quantity of additional bowel preparation given prior to endoscopy. Data were analysed on an intention to treat basis. Results: Twenty-three participants were randomised to the intervention group and thirty-four to the control group. Patient demographics were similar in both groups. Dietary restriction did not influence the success rate of bowel preparation: 97% successful bowel preparation in the DR group, vs 91% successful bowel preparation in the NDR group (p=0.559). Additional bowel preparation requirement were similar in both groups: 35% in DR group vs 39% in NDR group (p=0.768). Mean amount of additional bowel preparation required was similar: 560 ml in the DR group vs 460 ml in the NDR group (p=0.633). Conclusion: The quality of bowel preparation was comparable in patients with and without dietary restrictions prior to colonoscopy. Non-restrictive diets prior to bowel preparation should be considered to increase compliance. The sample size of this pilot study prohibited definite statistical conclusions but demonstrated this to be a reasonable methodology for a larger study. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/33728 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:40.116Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | Division of General Surgery |
| publisherStr | Division of General Surgery |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/33728 Bowel preparation for colonoscopy: is diet restriction necessary? Chang, Hung-Jou Goldberg, Paul Chu, Kathryn bowel preparation colonoscopy regular diet non-dietary restriction Background: Bowel preparation is essential for quality colonoscopy. Although most bowel preparation regimens recommend dietary restriction for 24 to 48 hours before the procedure, the evidence for this is poor. Objectives: To establish whether dietary restriction during bowel preparation improves the quality of bowel preparation. Methods: A prospective single blind, randomised controlled pilot study. The dietary restriction (DR) group was instructed not to ingest high fibre foods for 48 hours prior to the use of a polyethylene glycol (PEG) bowel preparation. The non-dietary restriction (NDR) group was not given any dietary modification, but received instructions for the use of the PEG-based preparation solution. On the day of colonoscopy, the quality of the bowel effluent was assessed, and additional preparation given as necessary. The primary endpoint was quality of bowel cleansing using the Harefield Cleansing Scale during colonoscopy. The secondary endpoint was the need for additional bowel preparation and quantity of additional bowel preparation given prior to endoscopy. Data were analysed on an intention to treat basis. Results: Twenty-three participants were randomised to the intervention group and thirty-four to the control group. Patient demographics were similar in both groups. Dietary restriction did not influence the success rate of bowel preparation: 97% successful bowel preparation in the DR group, vs 91% successful bowel preparation in the NDR group (p=0.559). Additional bowel preparation requirement were similar in both groups: 35% in DR group vs 39% in NDR group (p=0.768). Mean amount of additional bowel preparation required was similar: 560 ml in the DR group vs 460 ml in the NDR group (p=0.633). Conclusion: The quality of bowel preparation was comparable in patients with and without dietary restrictions prior to colonoscopy. Non-restrictive diets prior to bowel preparation should be considered to increase compliance. The sample size of this pilot study prohibited definite statistical conclusions but demonstrated this to be a reasonable methodology for a larger study. 2021-08-10T12:30:40Z 2021-08-10T12:30:40Z 2021 2021-08-02T11:33:45Z Master Thesis Masters MMed http://hdl.handle.net/11427/33728 eng application/pdf Division of General Surgery Faculty of Health Sciences |
| spellingShingle | bowel preparation colonoscopy regular diet non-dietary restriction Chang, Hung-Jou Bowel preparation for colonoscopy: is diet restriction necessary? |
| thesis_degree_str | Master's |
| title | Bowel preparation for colonoscopy: is diet restriction necessary? |
| title_full | Bowel preparation for colonoscopy: is diet restriction necessary? |
| title_fullStr | Bowel preparation for colonoscopy: is diet restriction necessary? |
| title_full_unstemmed | Bowel preparation for colonoscopy: is diet restriction necessary? |
| title_short | Bowel preparation for colonoscopy: is diet restriction necessary? |
| title_sort | bowel preparation for colonoscopy is diet restriction necessary |
| topic | bowel preparation colonoscopy regular diet non-dietary restriction |
| url | http://hdl.handle.net/11427/33728 |
| work_keys_str_mv | AT changhungjou bowelpreparationforcolonoscopyisdietrestrictionnecessary |