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Causality between the amplitude and frequency of cardiac oscillations

Palus, Milan and Stefanovska, Aneta and Veber, M. (2004) Causality between the amplitude and frequency of cardiac oscillations. Cardiovascular Engineering, 4 (2). pp. 127-132. ISSN 1567-8822

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Abstract

Using an information-theoretic approach, causality between the systolic amplitude in blood pressure and the frequency of the heart beat was analyzed. Blood pressure and ECG were noninvasively recorded in young, healthy subjects. Three successive measurements were performed: during spontaneous breathing and during paced respiration—at frequencies both higher and lower than that of spontaneous respiration. We demonstrate that the amplitude and frequency of the cardiac rhythm are synchronized for most of the time. The synchronization is stronger during paced respiration at a frequency lower than that of spontaneous breathing. Episodes where the cardiac frequency was driven by the systolic pressure were also detected during slow, paced respiration.

Item Type: Article
Journal or Publication Title: Cardiovascular Engineering
Uncontrolled Keywords: causality - cardiac frequency - systolic pressure - information theory - mutual information - synchronization - direction of driving
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 23902
Deposited By: ep_ss_importer
Deposited On: 23 Feb 2009 16:09
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:18
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/23902

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