Spectral Statistics of RR Intervals in ECG (CROSBI ID 94767)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Martinis, Mladen ; Mikuta-Martinis, Vesna ; Knežević, Andrea ; Črnugelj, Josip
engleski
Spectral Statistics of RR Intervals in ECG
The statistical properties (fluctuations) of heartbeat intervals (RR intervals) in ECG are studied and compared with the predictions of Random Matrix Theory (RMT). It is found that heartbeat intervals only locally exhibit the fluctuation patterns (universality) predicted by the RMT. This finding shows that heartbeat dynamics is of the mixed type where regular and irregular (chaotic) regimes coexist and the Berry-Robnik theory can be applied. It is also observed that the distribution of heartbeat intervals is well described by the one-parameter Brody distribution. The parameter $\beta$ of the Brody distribution is seen to be connected with the dynamical state of the heart.
heartbeat intervals; fluctuations; distributions
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