The dependence of RT beat-to-beat variability on heart period may involve complex relationships based on an unknown number of previous RR intervals. A mutual corrected conditional entropy, MCCE(L), may provide a global index of dependence, that avoids any a priori model and is a function of the number of heart beats considered. MCCE(L) is implemented through counts of sequences formed by one RT and L-l preceding RR intervals and contains a maximum entropy correction based on the percent of sequences appearing only a single time. The minimum of MCCE(L) indicates the optimal length of sequences in relation to the available data. The difference between its normalised value and l is an index of the regularity induced by RR on RT, ρrt-rr. Series of 300 RR and RT were extracted from ECG in 10 normal subjects (NS) and 10 patients two weeks after myocardial infarction (MI). A high ρrt-rr was displayed by NS, while this feature appeared to be disrupted in MI

Mutual corrected conditional entropy can measure RT-RR uncoupling in myocardial infarction patients / A. Porta, G. Baselli, E. Calegari, F. Mollisi, F. Lombardi, S. Cerutti. - In: COMPUTERS IN CARDIOLOGY. - ISSN 0276-6574. - 25:0(1998), pp. 297-300.

Mutual corrected conditional entropy can measure RT-RR uncoupling in myocardial infarction patients

A. Porta
Primo
;
F. Lombardi
Penultimo
;
1998

Abstract

The dependence of RT beat-to-beat variability on heart period may involve complex relationships based on an unknown number of previous RR intervals. A mutual corrected conditional entropy, MCCE(L), may provide a global index of dependence, that avoids any a priori model and is a function of the number of heart beats considered. MCCE(L) is implemented through counts of sequences formed by one RT and L-l preceding RR intervals and contains a maximum entropy correction based on the percent of sequences appearing only a single time. The minimum of MCCE(L) indicates the optimal length of sequences in relation to the available data. The difference between its normalised value and l is an index of the regularity induced by RR on RT, ρrt-rr. Series of 300 RR and RT were extracted from ECG in 10 normal subjects (NS) and 10 patients two weeks after myocardial infarction (MI). A high ρrt-rr was displayed by NS, while this feature appeared to be disrupted in MI
Settore ING-INF/06 - Bioingegneria Elettronica e Informatica
Settore MED/11 - Malattie dell'Apparato Cardiovascolare
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/24190
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