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The learning capacity and the classification ability for normal beats and premature ventricular contractions clustering by four classification methods were compared: neural networks (NN), K-th nearest neighbour rule (Knn), discriminant analysis (DA) and fuzzy logic (FL). Twenty-six morphology feature parameters, which include information of amplitude, area,(More)
Various methods for automatic electrocardiogram T-wave detection and Q-T interval assessment have been developed. Most of them use threshold level corrsing. Comparisons with observer detection were performed due to the lack of objective measurement methods. This study followed the same approach. Observer assessments were performed on 43 various T-wave(More)
We used principal component analysis (PCA) of the QRS complex to assess depolarisation heterogeity during ajmaline test in 96 patients with suspected Brugada Syndrome (BS). PCA was performed on 15-lead ECGs (12 leads +V1, V2 and V3 from 3<sup>rd</sup> intercostal space, V1h to V3h using a) V1, V2 and V3 (QRS-PCAstand), b) V1h, V2h and V3h (QRS-PCAhigh), and(More)
Fully automated method for QT interval measurement is presented. It includes ours: QRS detection algorithm and ECG signals preprocessing allowing suppression of power-line interference, electromyographic noise and baseline drift guaranteeing accurate preservation of the QRS-onset and T-end locality. Representative heart beat is automatically selected at the(More)
Analyses of electrocardiographic pattern recognition parameters for premature ventricular contraction (PVC) and Normal (N) beat classification are presented. Twenty-six parameters are defined: 11/spl times/2 for the two ECG leads, 3 for vectorcardiogram (VCG) and width of the complex. Some of them include: amplitudes of maximal positive and negative peaks,(More)
The aim of the present work was to study and analyse the presence of both T wave and QRS complex alternans (TWA&amp;QRSA) during diagnostic stress ECG test using principal component analysis, and wave amplitude computation on a combined lead. We studied 57 patients at a mean age of 65 &#x00B1; 12 y, 44% males. 28 of the patients had angiographically(More)
The present study was focused on high-resolution orthogonal electrocardiography (HR-OECG) analysis for assessment of the zone of necrosis after acute myocardial infarct (AMI). We examined HR-OECG recordings of 13 healthy controls, 9 patients with anterior AMI and 13 patients with inferior AMI. The AMI size was evaluated by the enzyme levels of creatine(More)