Multi-scale transitions of fuzzy sample entropy of RR-intervals and their phase-randomized surrogates: A possibility to diagnose congestive heart failure

• The complexity and regularity of a signal is defined. • It was shown that the information about the control of the heart rate variability is largely encoded in the phase of the Fourier transformed signal. • Distinct differences were observed in the biphasic multi-scale transition transitions betwe...
Ausführliche Beschreibung

• The complexity and regularity of a signal is defined. • It was shown that the information about the control of the heart rate variability is largely encoded in the phase of the Fourier transformed signal. • Distinct differences were observed in the biphasic multi-scale transition transitions between controls and patients suffering from congestive heart failure. • The differences between normalized fSEn surrogates and the RR-signal show a clear fast response lasting about 3–4s followed by a long lasting trend. • The average of the outlined differences classified patients and controls with a sensitivity of 87% and specificity of 89%. Ausführliche Beschreibung