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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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Predictive Feasibility Of Colonoscopy Without Sedation Using A Nomogram Model.

Haoxuan Chen1, Yujie Dong2, Shuxin Zhang3

  • 1Department of Anorectal, Dongzhimen Hospital, Beijing University of Chinese Medicine.

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Unsedated colonoscopy completion is hindered by constipation, high anxiety, and less experienced physicians. A predictive model helps identify at-risk patients to improve colonoscopy success rates and patient experience.

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Area of Science:

  • Gastroenterology
  • Medical Diagnostics
  • Public Health

Background:

  • Colorectal cancer is a significant global health issue.
  • Colonoscopy is a vital screening method for colorectal cancer.
  • Unsedated colonoscopy offers patient benefits but faces challenges in procedure completion.

Purpose of the Study:

  • To identify risk factors associated with unsedated colonoscopy incompletion.
  • To develop a predictive model for identifying patients at high risk of unsedated colonoscopy incompletion.
  • To enhance the completion rates and patient experience of unsedated colonoscopies.

Main Methods:

  • Retrospective analysis of 745 patients undergoing unsedated colonoscopy.
  • Division of patients into completion (n=670) and incompletion (n=75) groups.
  • Univariate and multivariate logistic regression analyses to identify risk factors; nomogram model development and validation.

Main Results:

  • Constipation (OR=4.981), high anxiety (OR=8.499), and examination by less experienced physicians (OR=3.319) were independent risk factors for incompletion.
  • The developed nomogram showed good predictive accuracy (Hosmer-Lemeshow: χ²=4.561, p=0.683) and discriminative ability (AUC=0.886).

Conclusions:

  • A predictive model incorporating constipation, anxiety, and physician experience can identify patients likely to incompletely undergo unsedated colonoscopy.
  • Preoperative identification of high-risk patients allows for optimized procedural planning, potentially including sedation or targeted interventions.
  • Improving unsedated colonoscopy completion rates can enhance patient adherence to screening protocols and improve overall outcomes.