Optimal and Safe Bowel Preparation for Colonoscopy

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Abstract

Effective colonoscopy requires an adequate level of cleansing as a basic component. This review will describe a compact review about general considerations in bowel preparation for colonoscopy and specific considerations for various patients. A low-fiber diet instead of a regular diet on the day before colonoscopy is an independent predictor of adequate bowel preparation. Improved bowel cleansing does not result from the routine use of enemas or prokinetics in addition to oral bowel preparation. For morning colonoscopy, a split method of 4 L polyethylene glycol on the day before and the day of colonoscopy is recommended, while patients scheduled for afternoon colonoscopy typically receive a full method of 4 L polyethylene glycol on the day of the procedure. Valid alternatives are 2 L polyethylene glycol plus ascorbic acid or 2 L sodium picosulphate plus magnesium citrate. Although there are no statistically significant differences between polyethylene glycol and oral sodium phosphate for colon cleansing, polyethylene glycol-based bowel preparation is advisable in most situations because of safety concerns.

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Association of colonoscopy and death from colorectal cancer.

Nancy Baxter, Meredith A. Goldwasser, Lawrence Paszat … (2009)

Colonoscopy is advocated for screening and prevention of colorectal cancer (CRC), but randomized trials supporting the benefit of this practice are not available. To evaluate the association between colonoscopy and CRC deaths. Population-based, case-control study. Ontario, Canada. Persons age 52 to 90 years who received a CRC diagnosis from January 1996 to December 2001 and died of CRC by December 2003. Five controls matched by age, sex, geographic location, and socioeconomic status were randomly selected for each case patient. Administrative claims data were used to detect exposure to any colonoscopy and complete colonoscopy (to the cecum) from January 1992 to an index date 6 months before diagnosis in each case patient and the same assigned date in matched controls. Exposures in case patients and controls were compared by using conditional logistic regression to control for comorbid conditions. Secondary analyses were done to see whether associations differed by site of primary CRC, age, or sex. 10 292 case patients and 51 460 controls were identified; 719 case patients (7.0%) and 5031 controls (9.8%) had undergone colonoscopy. Compared with controls, case patients were less likely to have undergone any attempted colonoscopy (adjusted conditional odds ratio [OR], 0.69 [95% CI, 0.63 to 0.74; P < 0.001]) or complete colonoscopy (adjusted conditional OR, 0.63 [CI, 0.57 to 0.69; P < 0.001]). Complete colonoscopy was strongly associated with fewer deaths from left-sided CRC (adjusted conditional OR, 0.33 [CI, 0.28 to 0.39]) but not from right-sided CRC (adjusted conditional OR, 0.99 [CI, 0.86 to 1.14]). Screening could not be differentiated from diagnostic procedures. In usual practice, colonoscopy is associated with fewer deaths from CRC. This association is primarily limited to deaths from cancer developing in the left side of the colon.

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Risk of developing colorectal cancer following a negative colonoscopy examination: evidence for a 10-year interval between colonoscopies.

Donna Turner, Charles Bernstein, LIN-XUE QIAN … (2006)

Limited evidence exists to guide the optimal frequency of repeat endoscopic examination for colorectal cancer screening after a negative colonoscopy. To determine the duration and magnitude of the risk of developing colorectal cancer following performance of a negative colonoscopy. Population-based retrospective analysis of individuals whose colonoscopy evaluations did not result in a diagnosis of colorectal neoplasia. Patients who had been evaluated between April 1, 1989, and December 31, 2003, were identified using Manitoba Health's physician billing claims database (N = 35 975). Standardized incidence ratios (SIRs) were calculated to compare colorectal cancer incidence in our cohort with colorectal cancer incidence in the provincial population. Stratified analysis was performed to determine the duration of the reduced risk. Patients with a history of colorectal cancer prior to the index colonoscopy, inflammatory bowel disease, resective colorectal surgery, and lower gastrointestinal endoscopy within the 5 years before the index colonoscopy were excluded. Cohort members were followed up from the time of the index colonoscopy until diagnosis of colorectal cancer, death, out-migration from Manitoba, or end of the study period on December 31, 2003. Incidence of colorectal cancer. A negative colonoscopy was associated with SIRs of 0.69 (95% confidence interval [CI], 0.59-0.81) at 6 months, 0.66 (95% CI, 0.56-0.78) at 1 year, 0.59 (95% CI, 0.48-0.72) at 2 years, 0.55 (95% CI, 0.41-0.73) at 5 years, and 0.28 (95% CI, 0.09-0.65) at 10 years. The proportion of colorectal cancer located in the right side of the colon was significantly higher in the colonoscopy cohort than the rate in the Manitoba population (47% vs 28%; P<.001). The risk of developing colorectal cancer remains decreased for more than 10 years following the performance of a negative colonoscopy. There is a need to improve the early detection rate of right-sided colorectal neoplasia in usual clinical practice.

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Duration of the interval between the completion of bowel preparation and the start of colonoscopy predicts bowel-preparation quality.

Byron Cryer, U. K. Yang, Stuart Spechler … (2009)

Recent studies suggest that colonoscopies done in the morning have better-quality bowel preparations than those done in the afternoon. We aimed to determine how the duration of the interval between the end of the preparation and the start of the colonoscopy affects preparation quality. We prospectively studied consecutive outpatients who had colonoscopies performed at our hospital within a 3-month period. The time of day when the colonoscopy started and the time interval from the last dose of preparation agent to the start of the colonoscopy were recorded. The endoscopist graded the quality of the preparation in the right side of the colon by using a 5-point visual scale. We studied 378 patients (96% men, mean age 62.2 years) who received preparations of polyethylene glycol electrolyte-based (PEG) and sodium phosphate (SP) solution (71%), oral PEG and magnesium citrate (23%), or SP alone (6%). Compared with patients whose preparations were graded as 2/3/4 (fair/poor/inadequate), those whose preparations were graded as 0/1 (excellent/good) had a significantly shorter interval between the time of the last preparation agent dose and the start of the colonoscopy (P = .013). We used a nonvalidated scale to assess the quality of bowel preparation. Bowel-preparation quality varies inversely with the duration of the interval between the last dose of the bowel-preparation agent and the start of colonoscopy. This interval appears to be a better predictor of bowel-preparation quality than the time of day when colonoscopy is performed.

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Author and article information

Journal

Journal ID (nlm-ta): Clin Endosc

Journal ID (iso-abbrev): Clin Endosc

Journal ID (publisher-id): CE

Title: Clinical Endoscopy

Publisher: The Korean Society of Gastrointestinal Endoscopy

ISSN (Print): 2234-2400

ISSN (Electronic): 2234-2443

Publication date (Print): May 2013

Publication date (Electronic): 31 May 2013

Volume: 46

Issue: 3

Pages: 219-223

Affiliations

Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea.

Author notes

Correspondence: Won Moon. Department of Internal Medicine, Kosin University College of Medicine, 262 Gamcheon-ro, Seo-gu, Busan 602-702, Korea. Tel: +82-51-990-5061, Fax: +82-51-990-3005, moonone70@ 123456hanmail.net

Article

DOI: 10.5946/ce.2013.46.3.219

PMC ID: 3678056

PubMed ID: 23767029

SO-VID: fdfec60e-fe73-4618-bb1f-d8c554cb2a8e

License:

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

History

Date received : 24 March 2013

Date revision received : 27 March 2013

Date accepted : 27 March 2013

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Most cited references 38

Association of colonoscopy and death from colorectal cancer.

Risk of developing colorectal cancer following a negative colonoscopy examination: evidence for a 10-year interval between colonoscopies.

Duration of the interval between the completion of bowel preparation and the start of colonoscopy predicts bowel-preparation quality.

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Cited by 8

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