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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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Endoscopic Procedures I: Esophagogastroduodenoscopy01:29

Endoscopic Procedures I: Esophagogastroduodenoscopy

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An Esophagogastroduodenoscopy (EGD) is a diagnostic procedure in which an endoscopist uses a flexible, lighted endoscope to visualize the upper gastrointestinal (GI) tract. The procedure includes visualizing the oropharynx, esophagus, stomach, and the first part of the small intestine, the duodenum.
During an EGD, the endoscope can be used to:
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Endoscopic Procedures IV: Sigmoidoscopy and Laproscopy01:26

Endoscopic Procedures IV: Sigmoidoscopy and Laproscopy

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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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Endoscopic Procedures III: Video Capsule Endoscopy01:28

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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,...
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Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy01:26

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This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
Radionuclide Testing
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In gastric emptying studies, a meal's liquid and...
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Assessment of the Rectum and Anus01:25

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Evaluating the rectum and anus plays a crucial role in conducting a thorough physical examination of the gastrointestinal system. Although it may be uncomfortable and often embarrassing for the patient, it holds immense diagnostic value, particularly in detecting gastrointestinal diseases and abnormalities. This guide will explain how to perform this assessment using inspection and palpation methods.
Rectal Inspection
Begin by inspecting the perianal and anal areas for color, texture, rashes,...
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Patient and Endoscopic Characteristics of Postcolonoscopy Colon Cancer-A Case-control Study.

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Area of Science:

  • Gastroenterology
  • Oncology
  • Preventive Medicine

Background:

  • Colonoscopy, a key tool for colorectal cancer (CRC) prevention, has limitations.
  • Postcolonoscopy CRC (PCCRC) refers to CRC diagnosed after a colonoscopy examination.
  • PCCRCs are categorized as noninterval or interval cancers.

Purpose of the Study:

  • To identify risk factors associated with PCCRC.
  • To compare risks between noninterval and interval PCCRCs.
  • To assess the impact of endoscopic quality and guideline adherence on PCCRC development.

Main Methods:

  • A retrospective case-control study was conducted.
  • Data from a Vermont tumor registry identified 54 PCCRC cases and 162 matched controls.
  • Cases were stratified into noninterval and interval PCCRC groups.

Main Results:

  • PCCRC risk, particularly noninterval PCCRC, was associated with a history of polyps, sessile serrated polyps, and high-risk adenomas (HRAs).
  • Index colonoscopies with large polyps or HRAs significantly increased PCCRC risk.
  • Nonadherence to American Gastroenterological Association surveillance guidelines was linked to increased PCCRC and interval PCCRC risk.

Conclusions:

  • Traditional CRC risk factors like precancerous polyps and HRAs are associated with overall and noninterval PCCRC.
  • Interval PCCRC was not linked to these traditional risk factors.
  • Endoscopic quality and adherence to surveillance guidelines are critical factors in PCCRC prevention, with approximately 30% of PCCRCs attributable to endoscopic quality.