Volume : 4, Issue : 7, July - 2015

DETECTION AND QUANTIFICATION OF T-WAVE ALTERNANS IN ECG BY SPECTRAL METHOD

Shraddha. D. Satav, Dhananjay E. Upasani

Abstract :

<p>T-wave alternans (TWA) is a cardiac phenomenon related to the mechanisms leading to ventricular arrhythmias and sudden cardiac death (SCD). It appears in the surface electrocardiogram (ECG) as a beat-to-beat alternation in the morphology of the repolarization, and its amplitude can be so low that it is imperceptible to the naked eye. Several signal processing methods proposed to detect TWA in the ECG and to quantify its amplitude. The objective of this project is to develop multilead analysis schemes for TWA analysis that improve the detection and quantification of TWA in the ECG. 50 ECG recordings provided by the 2008 PhysioNet/Computers in Cardiology Challenge were analyzed. After ECG pre-processing, Fast Fourier Transform (FFT) spectral analysis and principal component analysis (PCA) were used for TWA determination and quantification. The work carried out to achieve this goal is divided in two parts: The first part of the project introduces a general scheme for multilead analysis of TWA. The second part of the paper presents the methodological evaluation of the multilead scheme based on the different transformation techniques. Using spectral method, accuracy of TWA detection increased up to 94 %. Furthermore analyse the precision and recall parameters.</p>