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. 2020 Sep 9;72:58. doi: 10.1186/s43044-020-00094-w

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© The Author(s) 2020

Open AccessThis 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. 1 — Electrocardiography evaluation (a) performed on admission in the emergency room during pain period showed non-specific ST-T changes in lead V2-V5, (b) performed on the painless period after sublingual nitrate showed biphasic T waves inversions and minimally elevated ST segment in lead V2 and V3, (c) performed before transferred to hospital ward during the painless period showed deeply inverted T waves in leads V2-V4