Abstract
Purpose
Indocyanine green (ICG) and sodium fluorescein (SF) are fluorescent dyes used for sentinel lymph node mapping. In oncological gastric surgery, ICG lymphography has increased the number of resected lymph nodes. However, the optimal time to administer ICG is unclear, and both preoperative and intraoperative injections have been practised. As dye spillage will diminish lymphogram visibility, a second dye with different excitation and emission spectra may present a clinical alternative. We measured the time until maximum ICG fluorescence of gastric sentinel lymph nodes and investigated the feasibility of combined lymphography with two fluorescent dyes: ICG and SF.
Methods
Ten Danish Landrace/Yorkshire pigs were used in this study. After completion of the laparoscopic setup, ICG and then SF were endoscopically injected into the gastric submucosa. Lymphograms for both dyes were recorded, and the time until maximum ICG sentinel lymph node fluorescence was determined.
Results
The mean time until maximum ICG fluorescence of gastric sentinel lymph nodes was 50 s (± 12.5), and the fluorescent signal then remained stable until the end of the recorded period (45 min). A lymphogram showing both ICG and SF was acquired for eight of the ten pigs.
Conclusions
Because of the short time until maximum ICG fluorescence of sentinel lymph nodes, intraoperative injections could be a sufficient alternative to preoperative injections for oncological gastric surgery. Combined ICG and SF lymphography was feasible and resulted in clear lymphograms with no interference between the two dyes. The ability to use multiple dyes during a surgical procedure offers the exciting prospect of simultaneously assessing perfusion and performing fluorescence lymphography.
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Notes
The light source (CLV-180 EVIS EXERA II; Olympus, Tokyo, Japan) emits narrowband wavelengths that excite SF. However, our laparoscope was an older model, which the light source did not “accept.” We thus modified (manually overrode) the light source to “accept” our laparoscope.
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Acknowledgements
We thank Mikkel Marquard Jessen, Anders Bech Jørgensen, Olivia Mortensen, August Olsen, Karina Adler Riemenschneider, Andreas Arendtsen Rostved, and Søren Roepstorff (Department of Surgical Gastroenterology, Rigshospitalet, University Hospital of Copenhagen, Denmark) for their assistance with the surgical procedures. We would also like to thank the Department of Pathology (Rigshospitalet, University Hospital of Copenhagen, Copenhagen, Denmark) for their assistance with the tissue analyses.
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The corresponding author received funding from the Department of Surgical Gastroenterology, Rigshospitalet research fund.
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Study conception and design: JO, RS, NN, MBS, LBS, MA. Acquisition of data: JO, RS, NN, MBS. Analysis and interpretation of data: JO, RS, NN, MBS, LBS, MA. Drafting of the manuscript: JO. Critical revision and final approval of the manuscript: JO, RS, NN, MBS, LBS, MA.
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The study received approval from the Danish Animal Experiments Inspectorate (2019–15-0201–01664) and followed the Danish and European Union legislation on animal experimentation. It was supervised by research veterinarians at the Department of Experimental Medicine (The Panum Institute, University of Copenhagen, Copenhagen, Denmark).
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Osterkamp, J., Strandby, R.B., Nerup, N. et al. Time to maximum indocyanine green fluorescence of gastric sentinel lymph nodes and feasibility of combined indocyanine green/sodium fluorescein gastric lymphography. Langenbecks Arch Surg 406, 2717–2724 (2021). https://doi.org/10.1007/s00423-021-02265-y
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DOI: https://doi.org/10.1007/s00423-021-02265-y