M. Zochowski et al., AUTOCORRELATIONS OF R-R DISTRIBUTIONS AS A MEASURE OF HEART VARIABILITY, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 56(3), 1997, pp. 3725-3727
We introduce an algorithm for on-line measurement of instant changes o
f heart dynamics. It measures the variability of R-R segments in elect
rocardiagrams. The method is based on measuring the autocorrelations o
f the distributions of the system's dynamical variable. The algorithm
has been tested on a sample of cardiac conditions.