SPATIAL DISTRIBUTION OF LATE POTENTIALS ASSESSED BY SIGNAL-AVERAGED BODY SURFACE MAPPING

概要

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In order to evaluate the spatial location of late potentials (LPs), we designed a new system for the body surface mapping of signal-averaged, filtered ECG using 45 thoracic unipolar leads (5×9 array). Signals from patients with old myocardial infarction (MI,N=8), arrhythmogenic right ventricular dysplasia (N=1) and dilated cardiomyopathy (N=2) were amplified and passed through a digital bandpass filter (60-300Hz). Departure maps. LP isopotential maps. and LP_<30> area maps were generated and superimposed. The LP_<30> duration was determined as the section between the filtered QRS endpoints and points 30 msec before. Isopotential maps of the LPs showed distinct positive and negative regions. In 8 cases with MI. the extreme was related to the zones indicated by departure maps. and LP_<30> area maps also corresponded to the departure areas. Most importantly, the spatial distribution for the LP_<30> area map was different for each type of disease. In conclusion, body surface LP isopotential maps and LP_<30> area maps may provide useful information concerning the spatial distribution of LPs.
社団法人日本循環器学会の論文
1991-04-20