Determination of the left ventricular asynergic site by QRST isointegral mapping in patients with myocardial infarction.
QRST isointegral maps were made from 87 body surface ECGs in 41 patients with prior myocardial infarction. To evaluate the abnormalities of QRST isointegral maps, a deviation map was constructed from a deviation index, which expressed the deviation of the QRST time-integral value from the normal value at each lead point. Patients were divided into 3 groups according to the asynergic site on left ventriculograms: patients with anterior wall asynergy (n = 13), those with inferior wall asynergy (n = 13) and those with both anterior and inferior asynergies (n = 15). A consistent deviation map pattern was obtained in each group regardless of the QRS duration. Consequently, the deviation map was considered to be a practical method of identifying the asynergic site in patients with myocardial infarction, especially in those with intraventricular conduction disturbances. It is suggested that the deviation map can reveal abnormally altered intrinsic ventricular recovery properties resulting from a loss of the electromotive force of the infarcted myocardium.
D000328:Adult; D000368:Aged; D006328:Cardiac Catheterization; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009200:Myocardial Contraction; D009203:Myocardial Infarction / Q000503:physiopathology*; D014672:Vectorcardiography