QUANTITATIVE-EVALUATION OF BODY-SURFACE POTENTIAL MAPPING OF HEART ELECTRICAL-FIELD IN ISCHEMIC-HEART-DISEASE

New possibilities of quantitative evaluation of body surface potential mapping were studied in 78 patients with ischaemic heart disease. Int egral maps of the Q wave, QRS and ST-T intervals were plotted and isoc hronous maps of ventricular activation time and maps of asynchronous p otential minima of the Q wave were determined. Minimum and maximum pot ential values and their time relations were evaluated in the maps. Lef t ventricular contraction abnormality detected by left ventricular ang iography was determined by a point score and expressed as an index of asynergy. The number of coronary artery branches with significant narr owing was assessed and the extent of coronary artery damage was evalua ted by an arbitrary defined index. Using quantitative parameters from the maps, multiple stepwise linear regression was performed. The relat ionship between map parameters and index of asynergy corresponded to m ultiple correlation coefficient r=0.69 (p=0.01) in the whole group of patients. In the group of patients with left ventricular contraction a bnormality the relationship between these parameters was found to be r =0.87 (p=0.01). The relationship between map parameters and the number of coronary artery branches with significant stenosis was r=0.60 (p=0 .01) in the group of patients with positive coronary angiography. In t he same group of patients the relationship between map parameters and the index evaluating coronary artery damage was equal to r=0.63 (p=0.0 1). The data obtained from body surface integral maps enable to quanti fy cardiac ischaemic damage.