Multipolar QRST isointegral maps and QT dispersion in old myocardial infarction

Mozos, I. and Hancu, M. and Jost, N. and Cristescu, A. (2010) Multipolar QRST isointegral maps and QT dispersion in old myocardial infarction. Acta Physiologica Hungarica, 97 (1). pp. 11-21. ISSN 0231-424X

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Abstract

Chronic myocardial infarction (CMI) may create, due to structural heterogeneity, abnormal electrophysiological substrates which trigger re-entrant life-threatening ventricular arrhythmias.Methods: Electrical instability is assessed using body surface mapping (BSM) [multipolar isointegral QRST maps (mp IQRST)] and 12-lead ECG (QT dispersion: QTd: the difference between maximal and minimal QT interval). The aim was to find the relation between mp IQRST and QTd in CMI patients.Results: The 32 CMI patients, underwent 12-lead ECG and 64-lead BSM. The 80% (25) of the patients had mp IQRST maps. QTd was larger in patients with mp than those with dipolar maps (dp): 170±20 ms in mp vs 94±19 ms in dp, respectively. The latter, mp IQRST was associated with a decrease of maximum and a stronger minimum.Conclusions: Multipolar IQRST is associated with a loss of maximum values and increased absolute values of the minimum in CMI patients. IQRST and QTd provide similar information in predicting postinfarction arrhythmia risk.

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