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. 2020 Sep 24;405(8):1091–1099. doi: 10.1007/s00423-020-01990-0

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — Scheme of intraoperative nerve monitoring (IONM) signals from the right vagal nerve (VN) and recurrent laryngeal nerve (RLN). IONM superior to the separation of the RLN from the VN (red arrow) leads to typical VN signals (1). The signal resulting from RLN stimulation (2) showed insignificantly lower amplitudes than the signal resulting from VN stimulation (1). VN stimulation after the separation from the RLN does not lead to measurable signals in IONM (3). Mean signal characteristics resulting from the current investigation are presented. Abbreviations: E esophagus, IONM intraoperative nerve monitoring, VN vagal nerve, RLN recurrent laryngeal nerve, 2R lymph node station 2R according to [24], 4R lymph node station 4R according to [24], 7 lymph node station 7 according to [24]