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. 2021 Jul 5;23(7):e25791. doi: 10.2196/25791

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©Chi-Huang Shih, Pai-Chien Chou, Ting-Ling Chou, Tsai-Wei Huang. Originally published in the Journal of Medical Internet Research (https://www.jmir.org), 05.07.2021.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on https://www.jmir.org/, as well as this copyright and license information must be included.

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Real-time heart rate variability tracing over a duration of 4 days for patient P01. HR: heart rate; HF: high frequency; LF: low frequency; BPM: beats per minute.