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The influence of T-wave alternans (TWA) on vectocardiographic parameters has been presented. Alternations in the length and the angle of T-wave loop vector have been found between odd and even beats in electrocardiograms with detectable T-wave alternans. The study shows the significance of changes of T-wave loop vector length and angle in the process of shaping Twave alternans signal. The aim of the...
Measurements of surface HR ECG were carried out in an unshielded environment. Signals were acquired from one patient with implanted ICD (implantable cardioverter-defibrillator) during sinus rhythm and during atrial and ventricular stimulation. QRS, STT, QRST deflection areas and T wave alternans were studied. Significant differences between two ventricular activation sequences were found in spatial...
T-wave alternans (TWA), which has recently been detected at the micro-volt level, is a non-invasive marker of the vulnerability to ventricular arrhythmia. The aim of this study was to compare the presently used TWA detection methods and to determine the ECG signal acquisition and processing conditions ensuring the TWA detection at its lowest possible level. The results of the evaluation and comparison...
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