Universiti Teknologi Malaysia Institutional Repository

Dynamic ECG features for atrial fibrillation recognition

Abdul-Kadir, N. A. and Mat Safri, N. and Othman, M. A. (2016) Dynamic ECG features for atrial fibrillation recognition. Computer Methods and Programs in Biomedicine, 136 . pp. 143-150. ISSN 0169-2607

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Official URL: https://www.scopus.com/inward/record.uri?eid=2-s2....

Abstract

Background Atrial fibrillation (AF) can cause the formation of blood clots in the heart. The clots may move to the brain and cause a stroke. Therefore, this study analyzed the ECG features of AF and normal sinus rhythm signals for AF recognition which were extracted by using a second-order dynamic system (SODS) concept. Objective To find the appropriate windowing length for feature extraction based on SODS and to determine a machine learning method that could provide higher accuracy in recognizing AF. Method ECG features were extracted based on a dynamic system (DS) that uses a second-order differential equation to describe the short-term behavior of ECG signals according to the natural frequency (ω), damping coefficient, (ξ), and forcing input (u). The extracted features were windowed into 2, 3, 4, 6, 8, and 10 second episodes to find the appropriate windowing size for AF signal processing. ANOVA and t-tests were used to determine the significant features. In addition, pattern recognition machine learning methods (an artificial neural network (ANN) and a support vector machine (SVM)) with k-fold cross validation (k-CV) were used to develop the ECG recognition system. Results Significant differences (p < 0.0001) were observed among all ECG groups (NSR, N, AF) using 2, 3, 4 and 6 second episodes for the features ω and u/ω; 4, 6 and 8 second episodes for features ω and u; 4 and 6 second episodes for features ω, u and u/ω, and; 10 second episodes for the feature ξ. The highest accuracy for AF recognition (AF, NSR) using ANN with k-CV was 95.3% using combination of features (ω and u; ω, u and u/ω) and SVM with k-CV was 95.0% using a combination of features ω, u and u/ω. Conclusion This study found that 4 s is the most appropriate windowing length, using two features (ω and u) for AF detection with an accuracy of 95.3%. Moreover, the pattern recognition learning machine uses an ANN with 10-fold cross validation based on DS.

Item Type:Article
Uncontrolled Keywords:Artificial intelligence, Differential equations, Diseases, Dynamical systems, Electrocardiography, Feature extraction, Learning systems, Neural networks, Pattern recognition, Pattern recognition systems, Signal processing, Support vector machines, 10-fold cross-validation, Atrial fibrillation, Damping coefficients, K fold cross validations, Machine learning methods, Pattern recognition machines, Second-order differential equation, Second-order dynamic systems, Biomedical signal processing, Article, artificial neural network, atrial fibrillation, classification algorithm, clinical article, controlled study, electrocardiography, human, medical record review, pattern recognition, signal processing, support vector machine, atrial fibrillation, electrocardiography, pathophysiology, procedures, theoretical model, validation study, Atrial Fibrillation, Electrocardiography, Humans, Models, Theoretical
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:71149
Deposited By: Narimah Nawil
Deposited On:15 Nov 2017 01:19
Last Modified:15 Nov 2017 01:19

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