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The cardiovascular (CV) system typically exhibits complex dynamical behavior, which is reflected not only within a single data channel, but more importantly across data channels. Multivariate sample entropy (MSE) has been proven as a useful tool to analyze both the within-and cross-channel coupled dynamics, providing an insight into the underlying system complexity and coupling relationship. In this...
Histogram and scatter plot are important graphical indices for heart rate variability (HRV) analysis. However, they are difficult to quantify the complexity for time series and have little specificity to some cardiovascular diseases. This paper proposed a new graphical method for HRV analysis, which was named as RR sequence normalized histogram. Based on the analysis of RR sequence normalized histogram,...
Considering that the uncertainty noise produced the decline in the quality of ECGs, this paper proposed a real-time signal quality assessment method for ECGs collected using mobile phones. The method defines four “flags” to denote different type problems duo to the poor quality of ECGs: using flag1 to detect if there is a misplaced electrode; using flag2 to detect if there is a huge impulse; using...
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