Relationship between characteristics of endocardial electrograms and regional wall motion abnormalities in old...

In 40 patients with old myocardial infarction (MI), we evaluated the relationship between characteristics in endocardial electrograms and regional wall motion abnormalities at the MI site. Left ventricular ejection fraction (LVEF) was greater in the late-potentials (LPs) negative group (n = 21) than in the LPs positive group (n = 19), but this difference was not significant (57.6 +/- 19.8% vs 47.9 +/- 16.8%). Regional wall motion was assessed by the radial method. We used the percent left ventriculogram (%LVG) area change of each segment as a marker of regional wall motion. Correlation coefficients between electrographic amplitude and %LVG area change, electrographic duration and %LVG area change, and amplitude/duration ratio and %LVG area change were 0.3999 (p < 0.001), -0.2319 (p < 0.02), and 0.4312 (p < 0.001), respectively. Thus, characteristics of endocardial electrograms were significantly related to regional wall motion abnormalities in MI sites. In MI sites, as regional wall motion was reduced, the electrographic amplitude became smaller and the electrographic duration became longer. However, this relationship was not linked to that between LPs and LVEF.