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Content Provider | IET Digital Library |
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Author | Bakhshi, Asim Dilawer Bashir, Sajid Loan, Asim Maud, Muhammad Ali |
Abstract | Prognostic utility of microvolt T-wave alternans (TWAs) has been established since its clinical acceptance as markers for malignant ventricular arrhythmias, leading to sudden cardiac death. Accurate detection of TWA from surface electrocardiography is a challenge because of invisible nature of the phenomenon. A novel TWA detection scheme based upon analysis of continuous-time wavelet entropy (CTWE) trend of consecutive ventricular repolarisation complexes is presented. The CTWE is computed using relative wavelet energy coefficients of continuous wavelet transform. Variety of simulated alternan waveforms, wavelet functions, frequency bands and noise levels are used to test the algorithm. The algorithm achieves a sensitivity of 100% at signal-to-noise ratio (SNR) >35 dB for all the selected wavelet functions and sensitivities of 99.5, 97 and 92% for Symlet4, Mexican Hat and truncated Morlet functions, respectively, at 30 dB SNR. A performance improvement of 5 dB is achieved by only computing the wavelet coefficients at the optimal frequency band. This study concludes that CTWE can successfully characterise the heterogeneity of cardiac repolarisation and detect TWA phenomenon. |
Starting Page | 783 |
Ending Page | 790 |
Page Count | 8 |
ISSN | 17519675 |
Volume Number | 7 |
e-ISSN | 17519683 |
Issue Number | Issue 8, Oct (2013) |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-spr/7/8 |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-spr.2012.0128 |
Journal | IET Signal Processing |
Access Restriction | Open |
Rights Holder | © The Institution of Engineering and Technology |
Subject Keyword | Bioelectric Signal Biology And Medical Computing Cardiac Repolarisation Alternan Detection Continuous Wavelet Transform Continuous-time Wavelet Entropy CTWE Digital Signal Processing Electrocardiography Electrodiagnostics And Other Electrical Measurement Technique Entropy Function Theory And Analysis Gain 5 DB Integral Transforms Malignant Ventricular Arrhythmias Medical Signal Detection Mexican Hat Function Microvolt T-wave Alternan Noise Figure 30 DB Prognostic Utility Relative Wavelet Energy Coefficient Signal Detection Signal to Noise Ratio Simulated Alternan Waveform Surface Electrocardiography Symlet4 Function Truncated Morlet Function TWA Detection Scheme Ventricular RePolarisation Complex Wavelet Transform |
Content Type | Text |
Resource Type | Article |
Subject | Signal Processing Electrical and Electronic Engineering |
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