抄録
To clarify factors which have an influence on late potentials (LPs), signal averaged electrocardiogram, echocardiogram, cardiac catheterization and Holter monitoring were studied in 86 patients with previous myocardial infarction (MI). Group 1 consisted of 27 patients with LPs (LP duration⩾20 msec) and Group 2 consisted of 59 patients without them. Twelve percent of anterior MI and 35% of inferior MI had LPs. Left ventricular (LV) diastolic dimension was larger and % fractional shortening was lower in group 1 than those in group 2. Aneurysm was noted in 37% in group 1 and 17% in group 2 (p<0.05), and mean number of involved coronary vessels was 2.3±0.8 in group 1 and 1.7±0.8 in group 2 (p<0.05). No significant difference was found in other clinical and hemodynamic parameters. The incidence of patients with 100 or more ventricular premature contractions per hour and that with ventricular tachycardia (VT) were significantly higher in group 1 than in group 2 (26% vs 7%, p<0.05, 33% vs 7%, p<0.01, respectively). Multiple regression analysis and the method of quantification demonstrated that ventricular arrhythmia was most strongly associated with LP duration.
