A correlative study of anteroseptal asynergy and vectorcardiograpic findings in 276 cases with the lesion of the left anterior descending coronary artery.

Correlation of asynergies on the left ventriculogram with the transverse and frontal plane QRS loops recorded by the Frank lead system was investigated in 276 cases with a significant lesion of the left anterior descending coronary artery (luminal narrowing of 75% or more). Among the 97 cases with akinesis or dyskinesis in the anterior and/or septal segments, 84 satisfied the transverse plane VCG criteria for anterior myocardial infarction. Of the remaining 13 cases, 6 were diagnosed to have high lateral myocardial infarction based on the frontal plane VCG findings. Six of the 7 cases that were not diagnosed as having myocardial infarction evidenced concomitant akinesis in the inferoposterior segment. Of the 24 cases which had akinesis or dyskinesis localized in the apex, 10 showed a VCG pattern of anterior and/or high lateral myocardial infarction. Among 92 cases with hypokinesis in the anterior and/or septal segments, only 16 had VCG findings of anterior and/or high lateral myocardial infarction. There were no significant differences in the frequency of "bite" between these patients and the normal control group.