[Correlation between ventricular potentials and QT dispersion in patients with myocardial infarction]

We investigated QT dispersion (QTcd) and QT apex dispersion (QTad), corrected in relation to heart rate and the presence of ventricular late potentials (VLP) in 27 patients with previous myocardial infarction. VLP were considered positive when two of following tree criteria were satisfied: 1. HF QRS > 114 ms; 2. RMS 40 < 20 microV; 3. LAS > 38 ms. The patients were divided into two groups: group A--with VLP positive, 10 patients and group B--with VLP negative, 17 patients. Group A showed a significantly higher QTcd and QTad than group B (42 +/- 18.1 ms. v/s 24.7 +/- 14.2 ms, p = 0.01 for QTcd and 41 +/- 20.2 ms. v/s 23.5 +/- 11.1 ms, p = 0.007 for QTad). There is also a moderate expressed linear correlation between QTcd and HF QRS (r = 0.459). Our data suggest, that the presence of slowly conducting areas of myocardium, related to positive VLP is associated with expressed inhomogeneity of ventricular repolarisation pi. e. higher QTcd.