Pressure dye-spray: a simple and reliable method for differentiating adenomas from hyperplastic polyps in the colon

Area of Science:

• Gastroenterology
• Endoscopy
• Oncology

Background:

• Colonic polyps require accurate differentiation between adenomas and hyperplastic types.
• Traditional colonoscopy relies on visual cues like shape, size, and color.
• Chromoendoscopy with pressure dye-spray offers a novel approach to enhance polyp classification.

Purpose of the Study:

• To evaluate the diagnostic accuracy of pressure dye-spray chromoendoscopy.
• To compare pressure dye-spray with ordinary colonoscopic findings for polyp differentiation.
• To determine if pressure dye-spray can reliably distinguish between adenomas and hyperplastic polyps.

Main Methods:

• Utilized 0.035% indigo carmine dye with a spray-type cannula and water pump for pressure dye-spray chromoendoscopy.
• Polyps were initially assessed using ordinary colonoscopic findings.
• Pressure dye-spray was applied, classifying polyps based on blood oozing (adenoma) or lack thereof (hyperplastic).
• Histologic diagnosis was obtained for all polyps to validate findings.

Main Results:

• The study analyzed 1468 polyps (1201 adenomas, 267 hyperplastic polyps).
• Pressure dye-spray achieved a sensitivity of 97.9% and specificity of 96.6% for polyp differentiation.
• Ordinary colonoscopic findings had a sensitivity of 73.4% and specificity of 92.1%.

Conclusions:

• Pressure dye-spray chromoendoscopy is a dependable method for differentiating colonic adenomas from hyperplastic polyps.
• This technique offers superior accuracy compared to standard visual assessment during colonoscopy.
• The findings support the clinical utility of pressure dye-spray in improving polyp diagnosis.