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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

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Fig. 2 — Preparation of double-lumen tube with non-invasive surface electrodes. The endotracheal double-lumen tube is prepared with non-invasive surface electrodes (red arrows, a), which during intubation using video laryngoscopy (C-MAC®, Karl Storz SE & Co. KG, Tuttlingen, Germany) are positioned at the vocal cord level (b)