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Related Concept Videos

Endoscopic Procedures II: Colonoscopy01:25

Endoscopic Procedures II: Colonoscopy

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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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Inflammatory Bowel Disease I: Ulcerative Colitis01:27

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Introduction
Inflammatory bowel disease, or IBD, encompasses a group of disorders characterized by chronic inflammation or ulceration of the gastrointestinal tract.
Risk Factors
The exact cause of IBD remains unclear, although it is believed to be due to a mix of genetic, environmental, microbial, and immune factors. Genetic factors are significant in determining susceptibility to IBD, with family history being a critical risk factor. Individuals with a first-degree relative who has IBD are at...
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Endoscopic Procedures IV: Sigmoidoscopy and Laproscopy01:26

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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.
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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Esophageal Perforation-I: Introduction01:22

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Esophageal perforation is a severe medical condition characterized by a breach in the integrity of the esophageal wall. This breach can occur due to various factors such as trauma, medical procedures, or underlying diseases. When the esophageal wall is compromised, it allows food, fluids, and digestive juices into the chest cavity or adjacent structures, leading to potential complications and health risks.
The location of esophageal perforation can vary, occurring anywhere along the esophagus....
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Esophageal Perforation-II: Clinical Manifestations and Management01:28

Esophageal Perforation-II: Clinical Manifestations and Management

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Esophageal perforations manifest in various clinical forms, influenced by factors such as the perforation's cause and location (cervical, intrathoracic, or intra-abdominal), the extent of contamination, and potential injury to adjacent mediastinal structures. The timing between the perforation occurrence and treatment initiation also affects the clinical presentation.
Clinical Manifestations:
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Inflammatory Bowel Disease V: Surgical Management01:21

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Surgical interventions for inflammatory bowel disease (IBD), which includes ulcerative colitis and Crohn's disease, are essential in managing symptoms and addressing complications. The selection of surgical procedures is contingent upon the specific conditions and complications that stem from these illnesses.
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Related Experiment Video

Updated: Nov 8, 2025

Structured Approach to Colonoscopy Technique Optimization: A Single-Center Experience with Novice Endoscopists
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Perforation and post-polypectomy bleeding complicating colonoscopy in a population-based screening program.

Lawrence F Paszat1, Rinku Sutradhar1, Jin Luo2

  • 1University of Toronto, Toronto, Ontario, Canada.

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Summary
This summary is machine-generated.

Hospital admissions for colonoscopy complications like perforation and bleeding after a positive fecal occult blood test screen are infrequent but serious. Rates increase with patient age, comorbidity, and specific endoscopist factors.

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Area of Science:

  • Gastroenterology
  • Public Health
  • Epidemiology

Background:

  • Population-based colorectal cancer screening programs aim to detect cancer early.
  • Fecal occult blood test (FOBT) screening identifies individuals needing further investigation.
  • Colonoscopy is a key diagnostic and therapeutic procedure following a positive FOBT.

Purpose of the Study:

  • To estimate hospital admission rates for colonic perforation and post-polypectomy bleeding after outpatient colonoscopy.
  • To identify risk factors associated with these adverse events in a screened population.
  • To evaluate the safety of colonoscopy in the context of a population-based screening program.

Main Methods:

  • Retrospective cohort study of individuals aged 50-74 undergoing colonoscopy after a positive fecal occult blood test (FOBT) in Ontario, Canada (2008-2017).
  • Inclusion criteria: first positive CCC gFOBT, colonoscopy within 6 months, no colorectal cancer diagnosis within 24 months.
  • Adverse events: hospital admissions for colonic perforation (≤7 days) and post-polypectomy bleeding (≤14 days) post-colonoscopy.

Main Results:

  • Among 121,626 colonoscopies, perforation rate was 0.4-0.6 per 1000, and bleeding rate was 4.3 per 1000.
  • Risk factors for perforation and bleeding included older age (70-74 years), comorbidities, and lower endoscopist volume.
  • Complex polypectomy and specific endoscopist characteristics were also associated with increased risk.

Conclusions:

  • Colonic perforation and post-polypectomy bleeding are infrequent but serious complications following colonoscopy in colorectal cancer screening programs.
  • Patient factors like advanced age and comorbidities significantly increase the risk of these adverse events.
  • Endoscopist experience and procedural factors also play a role in the safety profile of colonoscopy.