Intraarterial indocyanine green (ICG) fluorescence augmentation by marking embryonal resection areas in colorectal surgery: a feasibility study in a porcine model.

Aim: In this pilot animal study we examined whether it is possible to visualize the embryonal resection layers by using intraarterial indocyanine green (ICG) staining when performing total mesorectal excision (TME) for carcinoma of the rectum. Material and methods: We injected ICG into the inferior mesenteric artery (AMI) of four swines to see whether the watershed area of the arterial supply zone can be sufficiently visualized by fluorescence imaging in order to mark the right dissection area along the fascia parietalis before and during resection.
Results: We observed a fluorescence signal in all the supplied areas of AMI but not in other parts of the abdominal cavity or other organs. Additionally, the mesorectum also showed a sharp border between colored and non-colored tissue.
Conclusion: In this study we present that resection borders may be determined before resection based on ICG-perfusion and we showed that intraoperative exclusive coloring of the rectum including the mesorectum is possible. Visualizing resection borders based on ICG-perfusion before settling the first cut may be a new approach in oncological surgery.