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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 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...
Lower GI Series: Barium Enema01:23

Lower GI Series: Barium Enema

A Barium Enema, or a lower GI series, is a specialized radiographic examination designed to visualize the lower gastrointestinal tract, specifically the colon and rectum. This procedure is instrumental in diagnosing various conditions such as colorectal cancer, polyps, diverticulosis, and inflammatory bowel disease.
Procedure Details
The examination begins by inserting a lubricated rectal tube into the patient's rectum to administer a radiopaque barium solution. The barium flow is carefully...
Inflammatory Bowel Disease V: Surgical Management01:21

Inflammatory Bowel Disease V: Surgical Management

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.
Here are some common surgical interventions for IBD:
Endoscopic Procedures I: Esophagogastroduodenoscopy01:29

Endoscopic Procedures I: Esophagogastroduodenoscopy

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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Related Experiment Video

Updated: Jun 26, 2026

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

Bowel preparations for colonoscopy: a review.

Gary Lichtenstein1

  • 1Division of Gastroenterology, Department of Medicine, Hospital of the University of Pennsylvania, 3400 Spruce Street, Philadelphia, PA 19104, USA. grl@uphs.upenn.edu

American Journal of Health-System Pharmacy : AJHP : Official Journal of the American Society of Health-System Pharmacists
|December 25, 2008
PubMed
Summary

Polyethylene glycol-electrolyte lavage solutions (PEG-ELSs) and sodium phosphate preparations are reviewed for bowel cleansing. Sodium phosphate may be more effective and tolerable, but caution is advised for patients with electrolyte issues.

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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

Related Experiment Videos

Last Updated: Jun 26, 2026

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

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

Area of Science:

  • Gastroenterology
  • Pharmacology

Background:

  • Bowel preparation is crucial for endoscopic procedures.
  • Polyethylene glycol-electrolyte lavage solutions (PEG-ELSs) and sodium phosphate preparations are primary agents for bowel purgation.
  • Understanding their mechanisms, efficacy, tolerability, and safety is essential for optimal patient care.

Purpose of the Study:

  • To review the mechanisms of action, clinical efficacy, tolerability, and safety of PEG-ELSs and sodium phosphate preparations.
  • To compare the effectiveness and patient experience of different bowel purgative regimens.

Main Methods:

  • Literature review of studies comparing PEG-ELSs and sodium phosphate preparations.
  • Analysis of clinical trial data on efficacy, tolerability, and safety profiles.
  • Evaluation of patient-reported outcomes and adverse event data.

Main Results:

  • PEG-ELSs work by osmotically drawing fluid into the bowel.
  • Sodium phosphate preparations are hyperosmotic, drawing fluid into the lumen for evacuation.
  • 2-L PEG-ELS regimens are as effective and more tolerable than full-volume preparations.
  • Sodium phosphate tablets offer a tolerable alternative to PEG-ELSs without compromising efficacy.
  • Proper renal function is critical for sodium phosphate safety.
  • Preventing dehydration is key to avoiding adverse events with any purgative.

Conclusions:

  • Next-generation PEG-ELS and sodium phosphate products are well-tolerated and patient-preferred.
  • Safety concerns persist for both classes of bowel purgatives.
  • Sodium phosphate is generally more effective and better tolerated than PEG-ELSs.
  • Administering sodium phosphate requires caution in patients with or at risk for electrolyte disturbances.