LAUSR

Background Anastomotic leak (AL) is the most feared complication in colorectal surgery. Indocyanine green (ICG) fluorescence angiography allows for real-time intraoperative evaluation of bowel perfusion. This study aimed to assess the impact of ICG on perioperative outcomes in patients treated with transanal total mesorectal excision (TaTME) for rectal cancer. Methods Comparative study based on a retrospective analysis of prospectively collected data, to validate the use of ICG assessment (ICGA) during TaTME (November/2011–June/2018). The primary outcome was the clinical AL rate. The secondary outcomes included modification of proximal colonic transection, anastomotic redo, additional surgical maneuvers and surgical morbidity. Results Two hundred and eighty-four patients were included, 204 (71.8%) in non-ICG group and 80 (28.2%) in ICG group. No significant differences were found in patient and tumor features. Mean anastomotic height was 4.85 cm vs. 5.04 cm ( p  = 0.500), diverting stoma was constructed in 205 patients (72.1% vs. 72.5%; p  = 0.941). Fluorescence angiography modified the surgical plan in 23 patients (28.7%). AL was diagnosed in 23 patients (11.3%) in the non-ICG group and in two patients (2.5%) in the ICG group ( p  = 0.020). Postoperative intraabdominal collection was diagnosed in 19 patients (7.4% vs. 5.1%; p  = 0.490), and reintervention was needed in 24 patients (10.8% vs. 7.6%; p  = 0.420). Median length of hospital stay was 6.0 (IQR 5.0–9) vs. 4.0 (IQR 3.0–8.5) ( p  = 0.005). ICGA was found as independent protective factor for AL in the multivariate analysis of the whole cohort ( n  = 284) (OR 0.142; 95% CI 0.032–0.633; p  = 0.010). Conclusion ICG fluorescence angiography modified the proximal colonic transection in more than one-quarter of patients, leading to a significant decrease of AL rate.