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2 Biocybernetics and Biomedical Engineering

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Optimal ECG lead system for arrhythmia assessment with use of TCRT parameter

Kania M., Fereniec M., Janusek D., Zbieć A., Kępski R., Karpiński G., Maniewski R.

Biocybernetics and Biomedical Engineering

2009

Vol. 29, no. 2

73-82

The aim of the study was to evaluate diagnostic value of TCRT (spatial QRS-T angle) parameter in different sets of ECG leads and to select the ECG lead set, for which the TCRT parameter would have the best sensitivity and specificity in identifying patients threatened by ventricular tachycardia (VT pts). Two groups of patients after myocardial infarction were studied: 13 non VT pts and 30 VT pts. The TCRT parameter values differentiated VT pts group from non VT pts group for all analyzed sets of ECG leads. Considering sensitivity of the TCRT parameter in identifying VT patients the best set of ECG leads was selected.

High-resolution multichannel measurement and analysis of cardiac repolarization

Fereniec M., Maniewski R., Karpiński G., Opolski G., Rix H.

Biocybernetics and Biomedical Engineering

2008

Vol. 28, no. 3

61-69

Time and spatial inhomogeneity of the repolarization phase is considered to be an important, noninvasive indication of sudden cardiac death in patients after myocardial infarction. Analysis of spatial variability of the repolarization phase was carried out on signals recorded with the 64-channel system for measurement of high-resolution ECG. The lead position on the torso, according to the University of Amsterdam lead system, was used. A new parameter, called the T-wave shape index and the distribution function method, as a method sensitive to shape variations, were applied to examine spatial variability of the T-wave shape in HR ECG maps. A group of 14 healthy volunteers and a group of 12 patients after myocardial infarction were studied. The diversity of spatial distributions of the parameters connected to the shape of the T-wave is clearly noticeable in the group of patients after myocardial infarction. The similarity of spatial distributions of proposed parameters in the group of healthy subjects is observed. The obtained results confirm the hypothesis that the spatial heterogeneity of the repolarization phase increases after myocardial infarction.