Qualitative and quantitative analysis of characteristic body surface potential map features in anterior and inferior myocardial infarction

摘要: Abstract Body surface potential maps were recorded from 120 electrode sites in 236 normal subjects and 258 patients with initial evidence of either anterior myocardial infarction (MI) or inferior MI to identify characteristic map patterns both groups. After time normalization, averaged distributions displayed at 18 equal intervals during QRS ST-T waveforms the normal, At each instant, 120-point was subtracted turn corresponding maps; resulting differences site divided by pooled standard deviation obtained values (discriminant indexes), plotted as contour lines 1 increments, producing discriminant for bigroup comparison. The most consistent 114 observed early upper left chest where abnormal negative voltages reflected loss electric potentials while reciprocal changes noticed lower back; mid-QRS, had moved jointly vertically, former torso on midsternal line, latter back. In 144 Ml, positive back, followed later excessive right chest; migrated horizontally, proceeding toward torso, dorsal area. Abnormal seen precordial region ST group, moving flank they stayed throughout T; group negativities appeared area beginning T remained there until end repolarization. Intragroup variability investigated scattergrams extrema peak indexes (≥2 deviations) derived individual within population. presence electrocardiographic subgroups suggested classes infarction: without apical involvement inferior-posterior ventricular extension group. Thus, types share a temporally common but spatially discriminating portion QRS. Repolarization groups also subjects, heterogeneous one other. Retrospective classification based more typical location their respective yielded 96% 93% correct assignment classes, respectively. specificity 94% control subjects.