A nonlinear model-free Granger causality approach was exploited to quantify the strength of the causal relation along cardiac baroreflex and cardiopulmonary pathway from spontaneous cardiovascular variabilities during head-down tilt (HDT). The analysis was completed through the assessment of traditional time and frequency domain parameters and cardiac baroreflex sensitivity. We found that, while respiratory sinus arrhythmia augmented, the power of the systolic arterial pressure variability in the low frequency band (i.e. from 0.04 to 0.15 Hz) decreased and cardiac baroreflex sensitivity increased, the strength of the causal relation along cardiac baroreflex and cardiopulmonary pathway remained constant. We conclude that, despite cardiopulmonary stimulation and sympathetic inhibition induced by HDT, neither cardiac baroreflex nor cardiopulmonary pathway took prevalence in governing heart period changes during HDT.
Directionality in cardiovascular variability interactions during head-down tilt test / A. Porta, A. Marchi, V. Bari, A.M. Catai, S. Guzzetti, F. Raimondi, R. Colombo (PROCEEDINGS OF THE ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY). - In: Engineering in Medicine and Biology Society (EMBC), 2014 36th Annual International Conference of the IEEE[s.l] : IEEE, 2014. - ISBN 9781424479276. - pp. 6008-6011 (( Intervento presentato al 36. convegno Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) tenutosi a Chicago nel 2014 [10.1109/EMBC.2014.6944998].
Directionality in cardiovascular variability interactions during head-down tilt test
A. Porta;V. Bari;
2014
Abstract
A nonlinear model-free Granger causality approach was exploited to quantify the strength of the causal relation along cardiac baroreflex and cardiopulmonary pathway from spontaneous cardiovascular variabilities during head-down tilt (HDT). The analysis was completed through the assessment of traditional time and frequency domain parameters and cardiac baroreflex sensitivity. We found that, while respiratory sinus arrhythmia augmented, the power of the systolic arterial pressure variability in the low frequency band (i.e. from 0.04 to 0.15 Hz) decreased and cardiac baroreflex sensitivity increased, the strength of the causal relation along cardiac baroreflex and cardiopulmonary pathway remained constant. We conclude that, despite cardiopulmonary stimulation and sympathetic inhibition induced by HDT, neither cardiac baroreflex nor cardiopulmonary pathway took prevalence in governing heart period changes during HDT.File | Dimensione | Formato | |
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