Abstract
Background
The development of feasible, reliable parameters and criteria for intestinal ultrasound (IUS) to estimate endoscopic remission of ulcerative colitis (UC) is a crucial clinical challenge. Such parameters must be simple, objective, and reproducible so that IUS can be widely used in daily practice. We developed a new parameter called the submucosa index (SMI), defined as a percentage of the submucosal thickness (SMT) in the total bowel wall thickness (BWT), and investigated its clinical potential.
Methods
The inclusion criteria were performance of both IUS and endoscopy (sigmoidoscopy or colonoscopy) for UC and a ≤ 15-day time interval between IUS and endoscopy. Loss of stratification was defined as inability to identify the submucosa even with a BWT of > 3 mm. The vascularity of the colon was assessed by the modified Limberg score (mLS) and evaluated as bowel wall flow (BWF) ( −) or ( +) using color Doppler mode. A Mayo endoscopic subscore (MES) of 0 or 1 was defined as endoscopic remission.
Results
Seventy-four colonic segments were analyzed. The SMI, mLS, and BWF could distinguish an MES of 1 versus 2 (p < 0.05, p < 0.01, and adjusted p < 0.001, respectively). The criteria using the BWT and SMI and using the BWT and BWF had the same estimating ability for endoscopic remission (sensitivity, 70.0%; specificity, 97.7%; positive predictive value, 95.5%; and negative predictive value, 82.7%).
Conclusion
The SMI is a practical, quantitative parameter based on the bowel wall structure and may be used to estimate endoscopic remission of UC.
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Acknowledgements
This work was supported in part by grants from the Japan Sciences Research Grant for Research on Intractable Diseases (Japanese Inflammatory Bowel Disease Research Group) affiliated with the Japan Ministry of Health, Labour and Welfare. We thank Angela Morben, DVM, ELS, from Edanz (https://jp.edanz.com/ac) for editing a draft of this manuscript.
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JM, RO, and HY conceived the study, designed the experiments, and analyzed the data. JM, RO, HY, HM, and NK prepared the manuscript. MM and TH supervised the writing of the manuscript. TH oversaw the entire project.
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Minoru Matsuura received consulting and lecture fees from Janssen Pharmaceutical K.K.; and received a scholarship grant from Nippon Kayaku Co., Ltd. Tadakazu Hisamatsu received consulting and lecture fees from Mitsubishi Tanabe Pharma Corporation, AbbVie GK, EA pharma Co., Ltd., Kyorin Pharmaceutical Co., Ltd., JIMRO Co., Ltd., Janssen Pharmaceutical K.K., Mochida Pharmaceutical Co., Ltd., and Takeda Pharmaceutical Co., Ltd.; and received research grants from Alfresa Pharma Co., Ltd., EA pharma Co., Ltd., Mitsubishi Tanabe Pharma Corporation, AbbVie GK, JIMRO Co., Ltd., Zeria Pharmaceutical Co., Ltd., Daiichi-Sankyo, Kyorin Pharmaceutical Co., Ltd., Nippon Kayaku Co., Ltd., Astellas Pharma Inc., Takeda Pharmaceutical Co., Ltd., Pfizer Inc., and Mochida Pharmaceutical Co., Ltd. Jun Miyoshi, Ryo Ozaki, Hiromi Yonezawa, Hideaki Mori, and Naohiro Kawamura have no conflict of interest.
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Miyoshi, J., Ozaki, R., Yonezawa, H. et al. Ratio of submucosal thickness to total bowel wall thickness as a new sonographic parameter to estimate endoscopic remission of ulcerative colitis. J Gastroenterol 57, 82–89 (2022). https://doi.org/10.1007/s00535-021-01847-3
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DOI: https://doi.org/10.1007/s00535-021-01847-3