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P310 The efficacy of linked colour imaging, a novel endoscopic enhancement system, for diagnosing mucosal redness in ulcerative colitis patients in clinical remission

T. Takagi1, K. Uchiyama1, M. Kajiwara1, Y. Azuma1, S. Takayama1, R. Yasuda1, K. Inoue1, H. Ryohei1, O. Dohi1, N. Yoshida1, K. Kamada1, T. Ishikawa1, N. Yagi2, Y. Naito1, Y. Itoh1

1Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan, 2Department of Gastroenterology, Asahi University Hospital, Gifu, Japan

Background

Endoscopic mucosal healing is considered as an important therapeutic goal in ulcerative colitis (UC) patients, and several endoscopic evaluations for colonic mucosa such as Mayo endoscopic subscore (MES) and Colitis Endoscopic Index of Severity (UCEIS) are used in clinical practice. Though the strict mucosal healing is defined as MES 0, the relapse of UC has been shown in the patients diagnosed as MES 0. In the present study, we aimed to investigate the efficacy of Linked Color Imaging (LCI), a novel endoscopic enhancement system, to predict long-term prognosis in UC patients diagnosed with MES 0.

Methods

Twenty-six patients with UC in clinical remission and diagnosed with MES 0 were enrolled. Endoscopic colonic images were assessed by LCI and UCEIS, using a LASEREO endoscopic system (FUJIFILM Co., Tokyo, Japan). Endoscopic LCI images were classified into three subgroups by LCI classification as previously reported. Briefly, LCI patterns were classified as A, no redness; B, redness with visible vessels; and C, redness without visible vessels. Forty months was defined as the time interval between endoscopic diagnosis and relapse of UC. Histological activity was scored according to the Geboes’ score (GS) and the active mucosa was defined by GS>2B.1.

Results

LCI classification can further subdivide the colonic mucosa diagnosed as MES 0. The patients with LCI-A showed no relapse and the non-relapse rates compared with the patients with LCI-B showed significantly higher (p = 0.033), while the relapse rates of the patients with UCEIS 0 showed no difference compared with UCEIS 1 (p = 0.148). There was no statistical difference in the composition of LCI-A and relapse rate between active and inactive mucosa diagnosed by GS score.

Conclusion

Endoscopic LCI classification can further subdivide samples diagnosed MES 0. LCI can be a novel and surpassing approach to evaluate mucosal healing and predict the outcome in UC patients.