Novel Intraoperative Imaging of Gastric Tube Perfusion during Oncologic Esophagectomy-A Pilot Study Comparing Hyperspectral Imaging (HSI) and Fluorescence Imaging (FI) with Indocyanine Green (ICG)

Simple Summary Oncologic esophagectomy with gastric conduit reconstruction is the gold standard in the curative treatment of localized esophageal cancer. Anastomotic leakage is one of the most significant postoperative complications and a predictor of increased postoperative mortality and deteriorated quality of life. Adequate perfusion is one of the essential prerequisites for anastomotic healing. An objective evaluation of the perfusion of the gastric conduit can be performed by hyperspectral imaging (HSI) and fluorescence imaging (FI) with indocyanine green (ICG) intraoperatively. The aim of this pilot study was to evaluate the feasibility and the potential of improved outcomes by simultaneous HSI and FI-ICG measurements of the gastric tube during esophagectomy. Background: Novel intraoperative imaging techniques, namely, hyperspectral (HSI) and fluorescence imaging (FI), are promising with respect to reducing severe postoperative complications, thus increasing patient safety. Both tools have already been used to evaluate perfusion of the gastric conduit after esophagectomy and before anastomosis. To our knowledge, this is the first study evaluating both modalities simultaneously during esophagectomy. Methods: In our pilot study, 13 patients, who underwent Ivor Lewis esophagectomy and gastric conduit reconstruction, were analyzed prospectively. HSI and FI were recorded before establishing the anastomosis in order to determine its optimum position. Results: No anastomotic leak occurred during this pilot study. In five patients, the imaging methods resulted in a more peripheral adaptation of the anastomosis. There were no significant differences between the two imaging tools, and no adverse events due to the imaging methods or indocyanine green (ICG) injection occurred. Conclusions: Simultaneous intraoperative application of both modalities was feasible and not time consuming. They are complementary with regard to the ideal anastomotic position and may contribute to better surgical outcomes. The impact of their simultaneous application will be proven in consecutive prospective trials with a large patient cohort.