Does chromoendoscopy improve the colonoscopic adenoma detection rate?

Area of Science:

• Gastroenterology
• Endoscopy
• Colorectal Cancer Screening

Background:

• The efficacy of chromoendoscopy with indigo carmine in enhancing colorectal polyp detection over standard colonoscopy remains unclear.
• This study aimed to clarify the diagnostic yield of indigo carmine chromoendoscopy for adenoma detection in the distal colon and rectum.

Purpose of the Study:

• To compare the adenoma detection rate of chromoendoscopy with indigo carmine versus standard colonoscopy.
• To evaluate if indigo carmine enhances polyp identification in the distal colon and rectum.

Main Methods:

• Prospective, back-to-back sigmoidoscopy evaluation in study patients.
• Standard high-resolution colonoscopy performed first, followed by a second examination restricted to the distal colon and rectum.
• Randomization for the second examination between chromoendoscopy with indigo carmine and standard colonoscopy.

Main Results:

• In the chromoendoscopy group (60 patients), 52 adenomas were detected.
• In the standard colonoscopy group (70 patients), 98 adenomas were detected.
• Detection rates were 26.9% for chromoendoscopy and 32.7% for standard colonoscopy, with no statistically significant difference (p = 0.47).

Conclusions:

• Chromoendoscopy with indigo carmine did not demonstrate a significant improvement in detecting adenomatous polyps compared to standard colonoscopy.
• The findings suggest that indigo carmine staining does not offer a superior detection rate for colorectal adenomas in this setting.