Long- and short-time analysis of heartbeat sequences: correlation with mortality risk in congestive heart failure
P Allegrini1, R Balocchi, S Chillemi
1Istituto di Linguistica Computazionale del Consiglio Nazionale delle Ricerche, Ghezzano-Pisa, Italy.
Abstract:
We analyze RR heartbeat sequences with a dynamic model that satisfactorily reproduces both the long- and the short-time statistical properties of heart beating. These properties are expressed quantitatively by means of two significant parameters, the scaling delta concerning the asymptotic effects of long-range correlation, and the quantity 1-pi establishing the amount of uncorrelated fluctuations. We find a correlation between the position in the phase space (delta, pi) of patients with congestive heart failure and their mortality risk.
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