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. 2021 Aug 6;21:382. doi: 10.1186/s12872-021-02185-1

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© The Author(s) 2021, corrected publication 2021

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/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — Myocardial bridging (MB) demonstrated by invasive coronary angiography during diastole (a) and systole (b). There was a significant narrowing on the anterior descending coronary artery during systole (white arrows). The MB on the diagonal branch (red arrows) or any other branch was rare and not analyzed in this study. The length from the beginning to the end of the coronary artery narrowing was measured as MB length (c)