Ventricular late potential duration correlates to the time of onset of electrical transients during ventricular activation in subjects post-acute myocardial infarction.

Ventricular late potentials (VLP) are electrical signals detected at the terminal region of the ventricular activation on surface ECG and often correlated to regions of fragmented electrical conduction in subjacent damaged myocardium. Intraventricular electrical transients (IVET) arisen from myocardial infarction scars may influence VLP identification depending on transient time of onset and duration. Seventy-six subjects after first ST elevation acute myocardial infarction (STEAMI) VLP were stratified according to initial myocardial wall insulted, whether anterior or inferior wall and electrical transient tracked throughout ventricular activation using spectral turbulence analysis technique. VLP were more prevalent in inferior than anterior STEAMI. No differences regarding IVET duration was observed between anterior and inferior STEAMI. Time of onset but not duration of IVET correlated to VLP duration. Scar location after STEAMI influences detection ventricular late potentials in SAECG.