Abstract
Background
Fluorescence-based enhanced reality (FLER) enables the quantification of fluorescence signal dynamics, which can be superimposed onto real-time laparoscopic images by using a virtual perfusion cartogram. The current practice of perfusion assessment relies on visualizing the bowel serosa. The aim of this experimental study was to quantify potential differences in mucosal and serosal perfusion levels in an ischemic colon segment.
Methods
An ischemic colon segment was created in 12 pigs. Simultaneous quantitative mucosal and serosal fluorescence imaging was obtained via intravenous indocyanine green injection (0.2 mg/kg), using two near-infrared camera systems, and computer-assisted FLER analysis. Lactate levels were measured in capillary blood of the colonic wall at seven regions of interest (ROIs) as determined with FLER perfusion cartography: the ischemic zone (I), the proximal and distal vascularized areas (PV, DV), and the 50% perfusion threshold proximally and distally at the mucosal and serosal side (P50M, P50S, D50M, D50S).
Results
The mean ischemic zone as measured (mm) for the mucosal side was significantly larger than the serosal one (56.3 ± 21.3 vs. 40.8 ± 14.9, p = 0.001) with significantly lower lactate values at the mucosal ROIs. There was a significant weak inverse correlation between lactate and slope values for the defined ROIs (r = − 0.2452, p = 0.0246).
Conclusions
Mucosal ischemic zones were larger than serosal zones. These results suggest that an assessment of bowel perfusion from the serosal side only can underestimate the extent of ischemia. Further studies are required to predict the optimal resection margin and anastomotic site.
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Acknowledgements
The authors would like to thank Renée Geraats, Marinka Oudkerk Pool, and Julian Abbing for technical and operative assistance. The authors are also grateful to Camille Goustiaux, Christopher Burel, and Guy Temporal for their assistance in proofreading the manuscript. The TEO®/laparoscopic equipment for this study has been kindly supplied by KARL STORZ SE & Co. KG.
Funding
This study was funded by the ARC Foundation (www.fondation-arc.org).
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Michele Diana is the recipient of the ELIOS grant from the ARC Foundation. Michele Diana and Andrey Klymchenko report a European patent application filed (no. 18305075.6) under the title “NIR fluorescent polymer coating”. Jacques Marescaux is the President of both IRCAD and IHU-Strasbourg Institutes, which are partly funded by KARL STORZ, Medtronic, and Siemens Healthcare. Manish Chand reports consultancy fees for teaching for Stryker. Barbara Seeliger, Vincent Agnus, Pietro Mascagni, Manuel Barberio, Fabio Longo, Alfonso Lapergola, and Didier Mutter have no conflicts of interest or financial ties to disclose.
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Seeliger, B., Agnus, V., Mascagni, P. et al. Simultaneous computer-assisted assessment of mucosal and serosal perfusion in a model of segmental colonic ischemia. Surg Endosc 34, 4818–4827 (2020). https://doi.org/10.1007/s00464-019-07258-z
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DOI: https://doi.org/10.1007/s00464-019-07258-z