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. 2022 Feb 23;9:833125. doi: 10.3389/fcvm.2022.833125

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Copyright © 2022 Jiang, Cai, Wu, Huang, Chen, Zhong, Gao, Guo and Zhou.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The beat-to-beat SBP series (A) and MSE curves (B) from one participant with hypertension (lower panel of A, black) and another participant without hypertension (upper panel of A, red). (A). An example of the beat-to-beat SBP series from one participant without hypertension (upper left panel) and from one participant with hypertension (lower left panel). Both participants had similar BP mean level and BP variability as displayed in the figure. (B) shows the MSE curve calculated from the SBP series of these two participants. The entropies of the participant with hypertension were lower than that of participants without, across all the five scales. This suggested that the complexity of SBP fluctuation was lower in hypertensive as compared to non-hypertensive, while the BP variability was similar.