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. 2020 Apr 22;10:6822. doi: 10.1038/s41598-020-63343-7

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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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Methods of equine ECG coarse-graining. (a) Cardinal points selected for complexity analysis. The greyed part of the plot shows a typical part of the ECG that was rejected for low signal quality. (b) Coarse-graining methods used for complexity analysis: TC - threshold crossing; BD - beat detection; FD - feature detection. Zero values are shown as white bars, unitary values as black or coloured bars. Note that the FD method captures significantly more information on the waveform shape than BD while being less sensitive to noise than the TC method.