The role of narrow band imaging (NBI) during follow-up after endoscopic polypectomy

Narrow-band imaging is one of the latest technological achievements of the digital endoscopy. The technique is using interference filter to light surfaces in narrow bands of red, green, and blue colour that visualizes the differences in mucosa colouring and enhances contrast between the mucosa surface and submucosa vascular network. The NBI makes easier differentiating between pathologic lesions from normal mucosa.
The study evaluates the possibility of using NBI for monitoring of the patients after endoscopic polypectomy of the colon.
Material and Method.
The study was conducted in 50 patients after endoscopic polypectomies for colonic adenomas with high-grade dysplasia. Control NBI endoscopy was performed 3 months after polypectomy using HDTV Olympus equipment series 180. During the study the attempts were made to localize polypectomy site, and the polypectomy scar was evaluated in the traditional light and using narrow band light. The material was taken for histopathological examination. The quality of obtained images was evaluated using a score system.
NBI failed to localize endoscopic polypectomy site in 19 patients, in 24 localized polypectomy scar and in the remaining 7 remaining or reccurent polyp. NBI illumination detected remaining adenoma in 6 patients with the localized polypectomy scar. Histopathological examination revealed low-grade adenoma in 6 patients with the remaining polyp and in 5 with polypectomy scar, as well as inflamatory reaction in the remaining cases.
A new technique of NBI enhances the visibility of lesions in mucosa, and the preliminary results are encouraging for the assessment of the endoscopic treatment accuracy.

Session: Podium Presentation

Program Number: S064

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