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Alteration of the P-wave non-linear dynamics near the onset of paroxysmal atrial fibrillation.

Martínez, A, Abásolo, D, Alcaraz, R and Rieta, JJ (2015) Alteration of the P-wave non-linear dynamics near the onset of paroxysmal atrial fibrillation. Med Eng Phys, 37 (7). pp. 692-697.

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Abstract

The analysis of P-wave variability from the electrocardiogram (ECG) has been suggested as an early predictor of the onset of paroxysmal atrial fibrillation (PAF). Hence, a preventive treatment could be used to avoid the loss of normal sinus rhythm, thus minimising health risks and improving the patient's quality of life. In these previous studies the variability of different temporal and morphological P-wave features has been only analysed in a linear fashion. However, the electrophysiological alteration occurring in the atria before the onset of PAF has to be considered as an inherently complex, chaotic and non-stationary process. This work analyses the presence of non-linear dynamics in the P-wave progression before the onset of PAF through the application of the central tendency measure (CTM), which is a non-linear metric summarising the degree of variability in a time series. Two hour-length ECG intervals just before the arrhythmia onset belonging to 46 different PAF patients were analysed. In agreement with the invasively observed inhomogeneous atrial conduction preceding the onset of PAF, CTM for all the considered P-wave features showed higher variability when the arrhythmia was closer to its onset. A diagnostic accuracy around 80% to discern between ECG segments far from PAF and close to PAF was obtained with the CTM of the metrics considered. This result was similar to previous P-wave variability methods based on linear approaches. However, the combination of linear and non-linear methods with a decision tree improved considerably their discriminant ability up to 90%, thus suggesting that both dynamics could coexist at the same time in the fragmented depolarisation of the atria preceding the arrhythmia.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
AuthorsEmailORCID
Martínez, AUNSPECIFIEDUNSPECIFIED
Abásolo, DUNSPECIFIEDUNSPECIFIED
Alcaraz, RUNSPECIFIEDUNSPECIFIED
Rieta, JJUNSPECIFIEDUNSPECIFIED
Date : July 2015
Identification Number : 10.1016/j.medengphy.2015.03.021
Uncontrolled Keywords : Atrial fibrillation, Central tendency measure, Electrocardiogram, Non-linear, P-wave
Related URLs :
Additional Information : Copyright 2015, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International https://creativecommons.org/licenses/by-nc-nd/4.0/
Depositing User : Symplectic Elements
Date Deposited : 19 Jun 2015 11:12
Last Modified : 01 Aug 2016 01:08
URI: http://epubs.surrey.ac.uk/id/eprint/807792

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