RESUMO
Problems in measuring the QT-dispersion are associated mostly with the inaccurate location of the T-wave end. The complications are: (i) In methodology due to various definition for Tend, (ii) In automatic measurements, due to low amplitude of T-wave, presence of U-wave and noise, and (iii) In manual measurements, due to lack of repeatability in the results, and involuntary subjectivism, when the QT-dispersion is measured by a person familiar with the ultimate goal of the study. New ECG repolarization parameter, 'T-Wave Area Dispersion' (TWAD), has been defined by Kenttä et al. 2018. Clustering ability of TWAD for prediction of risk for Sudden Cardiac Death (SCD) has been proven by the authors, working with a large database. We have measured TWAD in peri-, and postoperative ECG recordings of patients, undergoing coronary artery bypass grafting. Analysis of perioperative TWAD has shown an increased risk of adverse events in diabetics. Postoperative TWAD parameters have deteriorated proportionally in both diabetics/ non-diabetics groups indicating increased cardiac risk within the first ten postoperative days. The ability for diabetics/non-diabetics clustering of TWAD has been proven even in case of inaccurate location of the Tend. So far this is a reasonable advantage of TWAD vs. QT-dispersion in the study of ECG repolarization.
