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Endoscopic Procedures II: Colonoscopy01:25

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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:
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Biopharmaceutical studies constitute a vital field aiming to enhance drug delivery methods and refine therapeutic approaches, drawing upon diverse interdisciplinary knowledge. In research methodologies, the choice between controlled and non-controlled studies significantly influences the study's reliability and accuracy.
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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.
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Biases can arise at various stages of research, from study design and data collection to analysis and interpretation. Recognizing and addressing these biases is essential to ensure the validity and reliability of epidemiological findings.Broadly speaking, biases in epidemiology fall into three main categories: selection bias, information bias, and confounding. A more detailed description of possible biases is:  
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Observational studies are a type of analytical study where researchers observe events without any interventions. In other words, the researcher does not influence the response variable or the experiment's outcome.
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Related Experiment Video

Updated: Oct 17, 2025

Structured Approach to Colonoscopy Technique Optimization: A Single-Center Experience with Novice Endoscopists
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Risks associated with colonoscopy in a population-based colon screening program: an observational cohort study.

Marcel Tomaszewski1, David Sanders2, Robert Enns2

  • 1Department of Medicine, Division of Gastroenterology (Tomaszewski, Sanders, Enns, Cowie, Nash, Petrunia, Mullins, Telford), University of British Columbia; British Columbia Cancer Screening Programs (Gentile, Hamm, Azari-Razm, Bykov, Telford), Vancouver, BC marcel.a.tomaszewski@gmail.com.

CMAJ Open
|October 13, 2021
PubMed
Summary

Serious adverse events from colonoscopies in British Columbia’s screening program are comparable to other studies. The colonoscopy risks, including perforation and bleeding, meet established benchmarks for this FIT-based screening initiative.

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Area of Science:

  • Gastroenterology
  • Public Health
  • Medical Screening

Background:

  • Risks of colonoscopy within the British Columbia Colon Screening Program (BCCSP) were previously unknown.
  • This study aimed to quantify colonoscopy-related serious adverse events in the BCCSP.

Purpose of the Study:

  • To determine the rate of serious adverse events (SAEs) associated with colonoscopy in the BCCSP.
  • To assess the 14-day post-colonoscopy rates of perforation, bleeding, and death.

Main Methods:

  • Prospective observational study using the BCCSP database (Nov. 2013 - Dec. 2017).
  • Identified participants aged 50-74 with positive fecal immunochemical testing (FIT) results.
  • Recorded and reviewed unplanned medical events within 14 days of colonoscopy, classifying them as SAEs if related to death, hospitalization, or intervention.

Main Results:

  • A total of 96,192 colonoscopies were analyzed.
  • The overall rate of SAEs was 44 per 10,000 colonoscopies (95% CI 39-50).
  • Rates per 10,000 colonoscopies included: perforation (6), bleeding (26), and death (3 per 100,000).

Conclusions:

  • The rate of serious adverse events from colonoscopies in the BCCSP aligns with previous research and established benchmarks.
  • Findings provide crucial risk information for stakeholders involved in FIT-based colon cancer screening programs.