Comput. Biol. Med. - Multiscale entropy and detrended fluctuation analysis of QT interval and heart rate variability during normal pregnancy.

Tópicos

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Resumo

Pregnancy leads to physiological changes in various parameters of the cardiovascular system. The aim of this study was to investigate longitudinal changes in the structure and complexity of heart rate variability (HRV) and QT interval variability during the second half of normal gestation. We analysed 30-min high-resolution ECGs recorded monthly in 32 pregnant women, starting from the 20th week of gestation. Heart rate and QT variability were quantified using multiscale entropy (MSE) and detrended fluctuation analyses (DFA). DFA of HRV showed significantly higher scaling exponents towards the end of gestation (p<0.0001). MSE analysis showed a significant decrease in sample entropy of HRV with progressing gestation on scales 1-4 (p<0.05). MSE analysis and DFA of QT interval time series revealed structures significantly different from those of HRV with no significant alteration during the second half of gestation. In conclusion, pregnancy is associated with increases in long-term correlations and regularity of HRV, but it does not affect QT variability. The structure of QT time series is significantly different from that of RR time series, despite its close physiological dependence.

Resumo Limpo

pregnanc lead physiolog chang various paramet cardiovascular system aim studi investig longitudin chang structur complex heart rate variabl hrv qt interv variabl second half normal gestat analys min highresolut ecg record month pregnant women start th week gestat heart rate qt variabl quantifi use multiscal entropi mse detrend fluctuat analys dfa dfa hrv show signific higher scale expon toward end gestat p mse analysi show signific decreas sampl entropi hrv progress gestat scale p mse analysi dfa qt interv time seri reveal structur signific differ hrv signific alter second half gestat conclus pregnanc associ increas longterm correl regular hrv affect qt variabl structur qt time seri signific differ rr time seri despit close physiolog depend

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