Interobserver Variation of Bowel Preparation for Colonoscopy.

Area of Science:

• Gastroenterology
• Endoscopy
• Clinical Practice Guidelines

Background:

• Bowel preparation scales are crucial for guiding colonoscopy procedures but often lack consistent validation.
• Assessing the reliability of existing scales is essential for improving clinical practice.

Purpose of the Study:

• To evaluate the interobserver reliability of the Harefield Cleaning Scale (HCS) between internal and external endoscopists.
• To determine the HCS's effectiveness in assessing bowel preparation quality during colonoscopies.

Main Methods:

• A study involving 83 colonoscopy videos was analyzed.
• Internal endoscopists assessed bowel cleansing during procedures, while external endoscopists reviewed video recordings independently.
• Cohen's Kappa coefficient was used to quantify interobserver reliability.

Main Results:

• Fair agreement (Cohen's Kappa = 0.39) was observed between internal and external endoscopists using the HCS.
• Overall and high-quality bowel preparation rates were excellent and comparable between groups.
• Slight agreement was found for segmental scores in the descending and sigmoid colon.

Conclusions:

• The HCS demonstrates fair interobserver reliability but may have limitations in assessing bowel preparation in the left colon.
• Further validation of the HCS is needed for consistent clinical application, particularly for left-sided colonic segments.