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Related Concept Videos

Endoscopic Procedures II: Colonoscopy01:25

Endoscopic Procedures II: Colonoscopy

The colon, or large intestine, is the final segment of the digestive system. Its primary functions include absorbing water and vitamins produced by gut bacteria and transforming waste from liquid to solid to form stool. In adults, the large intestine is approximately 5 feet long and consists of four main sections:
Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy01:26

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
Radionuclide Testing
Radionuclide testing is a sophisticated medical technique for assessing gastrointestinal motility. It focuses on gastric emptying and colonic transit time. Radioactive markers track the movement of food through the digestive system, providing insights into gastrointestinal disorders.
In gastric emptying studies, a meal's liquid and solid...
Endoscopic Procedures III: Video Capsule Endoscopy01:28

Endoscopic Procedures III: Video Capsule Endoscopy

Capsule endoscopy, or wireless or video capsule endoscopy, is a diagnostic procedure for examining the entire gastrointestinal tract. Patients swallow a capsule about the size of a vitamin tablet. The capsule is equipped with a transmitter, a battery, an LED light source, and a color video camera to capture images throughout the gastrointestinal tract. This procedure is particularly useful for diagnosing conditions such as Crohn's disease, ulcerative colitis, tumors, polyps, ulcers, unexplained...
Endoscopic Procedures IV: Sigmoidoscopy and Laproscopy01:26

Endoscopic Procedures IV: Sigmoidoscopy and Laproscopy

Sigmoidoscopy and laparoscopy are distinct medical procedures that enable physicians to internally inspect different parts of the GI tract. Although they serve different purposes, each is essential for diagnosing and, in some cases, treating various medical conditions.
Sigmoidoscopy
Sigmoidoscopy is a diagnostic procedure that uses a flexible sigmoidoscope equipped with a light source and camera to examine the rectum and sigmoid colon. The procedure involves inserting the tube through the anus...

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Related Experiment Video

Updated: Jun 16, 2026

Structured Approach to Colonoscopy Technique Optimization: A Single-Center Experience with Novice Endoscopists
03:43

Structured Approach to Colonoscopy Technique Optimization: A Single-Center Experience with Novice Endoscopists

Published on: July 11, 2025

Evaluation of Polyp Detection Rates Following Changes in Colonoscopy Surveillance Intervals.

Seunghee Han1, Natalie Atese Yaa Akoto1, Aymen Naeem1

  • 1Medstar Union Memorial Hospital, Baltimore, USA.

Digestive Diseases and Sciences
|June 13, 2026
PubMed
Summary

Extending surveillance colonoscopy intervals to 7-10 years for patients with 1-2 small adenomas did not significantly increase neoplastic polyp detection. These findings support current guidelines for colorectal cancer screening intervals.

Keywords:
ColonoscopyGuidelinesLow risk adenomasScreening

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E-Patient Counseling Trial (E-PACO): Computer Based Education versus Nurse Counseling for Patients to Prepare for Colonoscopy
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Published on: August 1, 2019

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Last Updated: Jun 16, 2026

Structured Approach to Colonoscopy Technique Optimization: A Single-Center Experience with Novice Endoscopists
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Structured Approach to Colonoscopy Technique Optimization: A Single-Center Experience with Novice Endoscopists

Published on: July 11, 2025

E-Patient Counseling Trial (E-PACO): Computer Based Education versus Nurse Counseling for Patients to Prepare for Colonoscopy
06:28

E-Patient Counseling Trial (E-PACO): Computer Based Education versus Nurse Counseling for Patients to Prepare for Colonoscopy

Published on: August 1, 2019

Area of Science:

  • Gastroenterology
  • Oncology
  • Preventive Medicine

Background:

  • The U.S. Multi-Society Task Force (USMSTF) updated colorectal cancer (CRC) surveillance guidelines in 2020.
  • The updated guidelines recommend extending surveillance intervals to 7-10 years for patients with 1-2 small (≤10 mm) tubular adenomas after a high-quality baseline colonoscopy.
  • The impact of these extended intervals on polyp detection rates at repeat colonoscopies remains under investigation.

Purpose of the Study:

  • To evaluate whether extending surveillance colonoscopy intervals to 7 years or more affects polyp detection rates.
  • To compare the detection of any polyps and neoplastic polyps in patients with 1-2 small tubular adenomas undergoing surveillance at intervals <7 years versus ≥7 years.
  • To assess the safety and efficacy of the revised USMSTF surveillance recommendations.

Main Methods:

  • A retrospective study identified 399 patients with 1-2 small tubular adenomas who underwent surveillance colonoscopy within the MedStar Health system.
  • Patients were stratified into two groups: surveillance intervals <7 years (n=326) and ≥7 years (n=73).
  • Data on demographics, clinical factors, colonoscopy quality metrics (Boston Bowel Preparation Score, withdrawal time), and pathology results were collected and analyzed using Wilcoxon rank-sum and Fisher's exact tests.

Main Results:

  • Baseline characteristics and colonoscopy quality indicators were similar between the <7-year and ≥7-year surveillance interval groups.
  • Patients with ≥7-year intervals showed numerically higher, though not statistically significant, rates of any polyp detection (67% vs. 57%) and neoplastic polyp detection (55% vs. 48%).
  • No statistically significant differences in polyp or neoplastic polyp detection were observed between the groups.

Conclusions:

  • Extending surveillance colonoscopy intervals to ≥7 years for patients with 1-2 small, low-risk tubular adenomas does not significantly increase the detection of neoplastic polyps.
  • The findings support the safety and appropriateness of the 2020 USMSTF recommendation for 7-10 year surveillance intervals.
  • Further research with larger cohorts may be needed to definitively assess the impact of delayed surveillance on advanced neoplasia risk.