Cap-assisted colonoscopy (CAC) significantly extends visualization in the right colon.

Area of Science:

• Gastroenterology
• Endoscopy
• Colorectal Cancer Screening

Background:

• Colonoscopy is standard for colorectal neoplasia diagnosis but misses lesions, especially in the right colon.
• Transparent caps on colonoscopes may improve visualization but data is controversial.
• The quantitative impact of transparent caps on colonic visualization is not well-reported.

Purpose of the Study:

• To quantitatively analyze the visualization enhancement of cap-assisted colonoscopy (CAC) across colonic segments.
• To assess the impact of CAC on colonoscope advancement and withdrawal times.
• To determine if CAC improves the detection rate of mucosal lesions in the colon.

Main Methods:

• Randomized back-to-back colonoscopies with and without a transparent cap were performed in a colonic training model.
• Five investigators participated in the study.
• Colonic surface visualization was quantified by counting dots stained on the inner colonic surface.

Main Results:

• Cap-assisted colonoscopy (CAC) significantly increased overall colonic surface visualization from 59.76% to 85.36%.
• Visualization improvement was significant in the right colon but not the rectum, sigmoid, or descending colon.
• CAC did not significantly alter colonoscope advancement time but increased withdrawal time in several segments.

Conclusions:

• Cap-assisted colonoscopy (CAC) offers a significant extension of visualization, particularly beneficial for the right colon.
• The enhanced visualization may improve the detection of colorectal neoplasia in challenging areas.
• Further studies are warranted to confirm the clinical impact of CAC on lesion detection rates.