RELATIONSHIP BETWEEN CHARACTERISTICS OF ENDOCARDIAL ELECTROGRAMS AND REGIONAL WALL-MOTION ABNORMALITIES IN OLD MYOCARDIAL INFARCTIONS

In 40 patients with old myocardial infarction (MI), we evaluated the r elationship between characteristics in endocardial electrograms and re gional wall motion abnormalities at the MI site. Left ventricular ejec tion fraction (LVEF) was greater in the late-potentials (LPs) negative group (n=21) than in the LPs positive group (n=19), but this differen ce was not significant (57.6+/-19.8% vs 47.9+/-16.8%). Regional wall m otion was assessed by the radial method. We used the percent left vent riculogram (%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, a nd 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, characte ristics of endocardial electrograms were significantly related to regi onal wall motion abnormalities in MI sites. In MI sites, as regional w all motion was reduced, the electrographic amplitude became smaller an d the electrographic duration became longer. However, this relationshi p was not linked to that between LPs and LVEF.