Journal
ENTROPY
Volume 21, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/e21080727
Keywords
heart rate variability; entropy; nonlinear dynamics; cardiac autonomic neuropathy; diabetes
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Funding
- EFSD/JDRF/Lilly
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The time series of interbeat intervals of the heart reveals much information about disease and disease progression. An area of intense research has been associated with cardiac autonomic neuropathy (CAN). In this work we have investigated the value of additional information derived from the magnitude, sign and acceleration of the RR intervals. When quantified using an entropy measure, these time series show statistically significant differences between disease classes of Normal, Early CAN and Definite CAN. In addition, pathophysiological characteristics of heartbeat dynamics provide information not only on the change in the system using the first difference but also the magnitude and direction of the change measured by the second difference (acceleration) with respect to sequence length. These additional measures provide disease categories to be discriminated and could prove useful for non-invasive diagnosis and understanding changes in heart rhythm associated with CAN.
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