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Related Concept Videos

Assessment of the Rectum and Anus01:25

Assessment of the Rectum and Anus

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

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

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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...
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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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Lower GI Series: Barium Enema01:23

Lower GI Series: Barium Enema

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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.
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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...
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Chronic Bowel Disorders: Introduction01:17

Chronic Bowel Disorders: Introduction

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Chronic bowel diseases are a group of long-term conditions affecting the digestive tract, characterized by inflammation and damage to the gut lining. These conditions primarily include irritable bowel syndrome and inflammatory bowel disease.
Irritable Bowel Syndrome (IBS) is a common disorder affecting the gastrointestinal tract. The distinctive feature is recurrent abdominal pain associated with altered bowel movements, manifesting as constipation, diarrhea, or fluctuating between both. The...
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Irritable Bowel Syndrome II: Clinical Features and Diagnostic Evaluation01:30

Irritable Bowel Syndrome II: Clinical Features and Diagnostic Evaluation

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Irritable Bowel Syndrome II: Clinical Features and Diagnostic Evaluation
Irritable Bowel Syndrome (IBS) is classified into subtypes based on the predominant bowel habits as determined by the Bristol Stool Form Scale (BSFS). The subtypes are:
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Updated: Sep 11, 2025

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Is Cognitive Impairment Associated with Inadequate Bowel Preparation for Colonoscopy?

Jeanette M Daly1, Yinghui Xu2, Seth D Crockett2

  • 1From the University of Iowa Carver College of Medicine, Iowa City, IA (JMD, YX, RMH, BTL); University of North Carolina School of Medicine, Chapel Hill, NC (SDC); Oregon Health & Science University and Portland VA Medical Center, Portland, OR (SDC); Holden Comprehensive Cancer Center, University of Iowa, Iowa City, IA (RMH, BTL); and University of Iowa College of Public Health, Iowa City, IA (BTL). jeanette-daly@uiowa.edu).

Journal of the American Board of Family Medicine : JABFM
|August 11, 2025
PubMed
Summary

Lower household income, not cognitive status, significantly increases the risk of inadequate bowel preparation for colonoscopies. This finding is crucial for improving colonoscopy success rates and patient outcomes.

Keywords:
Cancer ScreeningCatharticsClock TestCognitionCognitive ImpairmentsCohort StudiesColon CancerColonoscopyCross-Sectional StudiesQuantitative ResearchScreening

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Area of Science:

  • Gastroenterology
  • Public Health
  • Cognitive Science

Background:

  • Inadequate bowel preparation (IBP) negatively impacts colonoscopy efficacy, leading to missed diagnoses and increased healthcare costs.
  • Factors influencing IBP are critical for developing targeted interventions to improve colonoscopy quality.
  • Cognitive status, assessed via tools like the clock drawing test, is a potential, yet understudied, factor in IBP.

Purpose of the Study:

  • To determine if impaired cognitive status, indicated by an abnormal clock drawing test, is associated with inadequate bowel preparation (IBP).
  • To identify demographic and clinical characteristics linked to IBP in patients undergoing colonoscopy.

Main Methods:

  • A cross-sectional cohort study involving 2,016 participants aged 50-85 undergoing screening or surveillance colonoscopies.
  • Participants completed stool tests and a clock drawing test prior to colonoscopy.
  • IBP was assessed using the Aronchick bowel preparation score; cognitive status was evaluated via validated clock drawing methods.

Main Results:

  • Of 2,016 participants, 6% (119) had IBP, and 21% (421) exhibited an abnormal clock drawing.
  • An abnormal clock drawing score did not show a statistically significant association with IBP after controlling for age (OR=1.44, 95% CI: 0.94-2.22).
  • Lower household income (<$40,000) was significantly associated with increased odds of IBP (OR=2.48, 95% CI: 1.56-3.95) compared to higher income (>$80,000).

Conclusions:

  • Lower household income is a significant predictor of inadequate bowel preparation for colonoscopies.
  • Cognitive impairment, as measured by the clock drawing test, was not found to be significantly associated with IBP in this cohort.
  • Findings suggest socioeconomic factors play a more prominent role in IBP than cognitive status, guiding future intervention strategies.