The Utility of Time Segmental Withdrawal During Screening Colonoscopy for Increasing Adenoma Detection Rate.

The Utility of Time Segmental Withdrawal During Screening Colonoscopy for Increasing Adenoma Detection Rate. A Randomized Controlled Clinical Trial.

Colonoscopy( examining the colon with a flexible tube and a camera ) is usually done for screening purposes to find any precancerous lesions (polyps) at an early stage. During the colonoscopy the doctor will advance the colonoscope to the end of your colon and start examining the colon for any polyps. "Withdrawal time" is the period of time the doctor spends examining the colon. Doctors usually spend six minutes examining the colon after they reach the end of the colon. Studies have showed that spending more withdrawal time detects more lesions. The proposal to dedicating half of the withdrawal time during colonoscopy in examining the right side will increase the detection of polyps in the right side of the colon. There will be no other changes in the procedural aspect of the colonoscopy.

Study Overview

• Status: Terminated
• Conditions: Adenomatous Polyp of Colon
• Intervention / Treatment: Other: Segmental withdrawal

Detailed Description

Screening colonoscopy is an essential diagnostic tool in the early detection of precancerous colonic lesions, preventing the progression of these lesions to cancer. Population-based and case control studies found a 50% reduction in colo-rectal cancer (CRC) incidence and up to a one-third reduction in mortality from CRC after screening colonoscopy. The effectiveness of colonoscopy in preventing colon cancer is dependent on the adenoma detection rate (ADR) during the procedure. Studies have demonstrated that withdrawal times of 6 minutes or more had higher rates of detection of any neoplasia. In 2006 joint task force of the American College of Gastroenterology and American Society for Gastrointestinal Endoscopy changed the recommendation to indicate that average withdrawal time should exceed 6 minutes in normal colonoscopies in which no polypectomies or biopsies were performed. Based on this recommendation, the 6-minute benchmark is the current standard of care. Longer mean withdrawal times are associated with increasing adenoma detection, mainly of small or right-sided adenomas and proximal serrated adenomas, presumably due to longer inspection of the right colon. However, it also have been showed withdrawal time using 6 minutes as the threshold is not a strong predictor of the likelihood of finding a polyp during colonoscopy and should not be used as a quality indicator. New CRC diagnosis within 3 years of negative screening colonoscopy can be as high as 6%. Right-sided lesions, flat polyps, and variability in endoscopist quality measures are all potential reasons why interval cancers develop. A recent observational study was published showing increase in ADR after implementation of a protocol of careful inspection during a minimum of 8 minutes was established. The investigators hypothesized that if colonoscopists would spend at least half of the time of the withdrawal time in the right side of the colon (referred as segmented protocol), ADR can increase mainly due to the detection of lesions in the right side, which could have been missed otherwise. The investigators are conducting a single center randomized trial investigating the utility of timed segmental withdrawal of at least 3 minutes each in both right and left side of the colon respectively, compared to the regular 6 minutes total withdrawal time regardless of where the time was spent in the colon.

• Study Type: Observational
• Enrollment (Actual): 232

Contacts and Locations

Study Locations

• United States
  • Texas
    • Houston, Texas, United States, 77030
      • Baylor College of Medicine

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 80 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

• Sampling Method: Probability Sample

Study Population

Study participants will be recruited from patients ages 18-80 scheduled for a screening colonoscopy at Baylor College of Medicine. Informed consent will be obtained from the patients during their Gastroenterology clinic visit if the procedure scheduled by gastroenterologist or during their pre-procedure assessment appointment if they were referred by a primary care doctor. Participation in the study will be voluntary. We use the split prep protocol in preparation for colonoscopy in all patients undergoing colonoscopy in our unit.

Description

Inclusion Criteria:

• Adult patients (18-80 years) who are undergoing colonoscopy for screening or surveillance purposes.

Exclusion Criteria:

1. Patients with a prior history of colonic surgeries
2. Patient with Crohns colitis or ulcerative colitis
3. Patient with prior history of colon cancer
4. Patient with poor bowel preparation
5. Pregnant women

Study Plan

How is the study designed?

Design Details

• Observational Models: Cohort
• Time Perspectives: Prospective

Number of groups / cohorts

2

Cohorts and Interventions

Group / Cohort	Intervention / Treatment
non segmental withdrawal; A standard of care colonoscopy will be done on the patient without extra time on the right side of the colon.
Segmental withdrawal; A standard of care colonoscopy will be done on the patient , however the time spent in the right side of the colon will be more than half of the normal colonoscopy procedure (i.e. more than 3 minutes)	Other: Segmental withdrawal; Interventional group will have at least 3 minutes dedicated to the right side of the colon during segmental withdrawal.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Increase in detection rate of adenomas in the right side of the colon	To determine if timed segmental withdrawal protocol can increase the adenoma detection rate in the right side of the colon compared to non segmental withdrawal.	30 minutes

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Sessile Serrated lesion detection rate	Compare sessile serrated lesion detection rate between patients undergoing a screening colonoscopy with segmental withdrawal protocol and non-segmental withdrawal protocol.	30 minutes

Collaborators and Investigators

• Sponsor: Baylor College of Medicine
• Investigators: Principal Investigator: Mohamed O. Othman, MD, Baylor College of Medicine

Study record dates

Study Major Dates

• Study Start: August 1, 2015
• Primary Completion (Anticipated): June 1, 2020
• Study Completion (Actual): April 2, 2020

Study Registration Dates

• First Submitted: August 31, 2015
• First Submitted That Met QC Criteria: September 1, 2015
• First Posted (Estimate): September 2, 2015

Study Record Updates

• Last Update Posted (Actual): October 28, 2020
• Last Update Submitted That Met QC Criteria: October 26, 2020
• Last Verified: October 1, 2020

More Information

Terms related to this study

• Keywords: Colonoscopy; Adenoma; withdrawal time
• Additional Relevant MeSH Terms: Neoplasms by Histologic Type; Neoplasms; Neoplasms, Glandular and Epithelial; Pathological Conditions, Anatomical; Polyps; Intestinal Polyps; Adenoma; Colonic Polyps; Adenomatous Polyps
• Other Study ID Numbers: H-37320