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A study of nonlinear dynamics of the heart rate variability (HRV) was performed using hidden Markov models (HMM) and mutual information (Ml). A methodology based on HMM has been developed in the present work. Cardiac RR series were analyzed in the three frequency bands: HF (0.15-0.45 Hz), high frequency band; LF (0.04-0.15 Hz), low frequency band; VLF (0.003-0.04 Hz), very low frequency band. These...
Synchronization and regularity between different rhythms were evaluated in the HRV using hidden Markov models (HMMs) at very low (VLF), low (LF) and high (HF) frequency bands. Phase synchronization of these rhythms was studied in RR series of hypertrophic cardiomyopathy (HCM) patients during the sleeping period. Two groups of patients were considered in the HCM group: high risk (HR), patients after...
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