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Autori: De Ambroggi L, Corlan AD
Editorial: Italian Heart Journal, 5, p.176S-178S, 2004.
The T wave complexity can be studied using multiple thoracic leads (surface potential maps) or the 12-lead ECG. Body surface potential maps (BSPM) have two major advantages over the conventional 12 leads: to explore the entire chest surface and to be more sensitive in detecting local electrical events. On the other hand, the method of BSPM is impractical for wide clinical use. Different methods of analysis of BSPM have been used to study repolarization potentials: instantaneous potential distribution, QRS-T integral maps, eigenvector analysis, principal component analysis, autocorrelatin analysis. By means of the conventional 12-lead ECG, different variables for quantitation of repolarization heterogeneity have been proposed, in addition to QT dispersion, that has been proved to be a gross estimate of repolarization abnormalities: principal components, total cosine R-to-T, T wave residuum and others. These variables showed good prognostic value in large clinical trials recently reported.
Cuvinte cheie: repolarizare ventriculara, predictia riscului aritmic, harti ECG computerizate de suprafata // ecg body surface mapping, ventricular repolarization, arrhythmic risk prediction