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Background Growing evidences have shown that there are important advantages related to the utilisation of indocyanine green fluorescence imaging (ICG-FI) to reduce the risk of postoperative anastomotic leakage (AL) in colorectal surgery. However, the impact of ICG-FI on postoperative AL of Crohn’s disease (CD) following intestinal resection has not been investigated. Methods This is a retrospective study of consecutive CD patients who were treated with intestinal resection and anastomosis at a single institution between January 2017 and August 2019. The cohort was divided into 2 groups, those with ICG-FI compared with those without ICG-FI for intestinal resection. ICG was administered intravenously with a bolus of 5 mg, and the intestinal perfusion was evaluated by a SPY Elite system. Their baseline characteristics and perioperative outcomes were further analysed. Results No adverse reactions were recorded. Of the 88 CD patients who underwent intestinal resection, 36 patients underwent ICG-FI during intestinal resection, while 52 CD patients who underwent routine intestinal resection were from a prospectively maintained database. The 2 groups were similar in terms of patient demographics, immunosuppressive medication use, and the procedural factors. In patients with ICG-FI, poor perfusion of the bowel judged by ICG-FI led to additional intestinal resection in 25% (9/36). ICG-FI reduces the AL rate from 13.5% (7 leaks) of non-ICF-FI group to 8.3% (3 leaks) in ICG-FI group (p = 0.456). Forty-four (50%) patients had previous intestinal resection. Overall, 10 anastomotic leaks were identified (11.4% leak rate). There were 2 leaks (4.5%) detected in patients with no previous intestinal resection, compared with 8 leaks (18.2%) identified in patients with a history of previous intestinal resection (p = 0.044). The number of previous resections correlated with increasing risk for AL (correlation coefficient = 0.998). In univariate analysis, steroid use, CRP level and preoperative weight loss &amp;gt;10% in 6 months were independently associated with AL. Conclusion ICG-FI is applicable to intestinal resection for CD and may play a role in perfusion-related AL. A large prospective randomised trial should be warranted.

P646 Utilisation of indocyanine green fluorescence imaging for Crohn’s disease following intestinal resection