Key result
The Wigner Ville Distribution provides a true time-frequency distribution of cardiac late potentials with no smear in the time or frequency directions compared to Short Time Fourier Transform.
Why the study?
Does the Wigner Ville Distribution provide better time-frequency analysis of cardiac late potentials compared to Short Time Fourier Transform in patients with coronary artery disease and sustained ventricular arrhythmias?
Does the Wigner Ville Distribution provide better time-frequency analysis of cardiac late potentials compared to Short Time Fourier Transform in patients with coronary artery disease and sustained ventricular arrhythmias?
The Wigner Ville Distribution offers an improved method for analyzing cardiac late potentials without the time-frequency smearing seen with traditional Short Time Fourier Transform.
Does not support replacing STFT for late potential analysis; leaves open whether WVD improves arrhythmia risk stratification.
Electrocardiograms (ECG) of patients with coronary artery disease and sustained ventricular arrhythmias contain late in the terminal phases of the ventricular depolarization. Late potentials (LP) are characterized as high frequency low amplitude signals. Information about LPs in the time and frequency domains is important in patient prognosis. The use of Short Time Fourier Transform (STFT) to obtain a time-frequency distribution of the ECG signal produces smearing in both the time and frequency domains. The Wigner Ville Distribution (WVD) gives a true time-frequency distribution of the given signal with no smear in the time or frequency directions. This paper describes the use of the WVD in analyzing cardiac LPs.
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Waldo et al. (2005) studied Coronary artery disease and sustained ventricular arrhythmias. Wigner Ville Distribution (WVD) vs. Short Time Fourier Transform (STFT) was evaluated on Time-frequency distribution of the ECG signal. The Wigner Ville Distribution provides a true time-frequency distribution of cardiac late potentials with no smear in the time or frequency directions compared to Short Time Fourier Transform.
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