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Detection of the Spatial Distribution of Late Potentials by Body Surface Mapping Using Forty-Five Unipolar, Leads

Department of Clinical Pathology, Iwate Medical University

Minoru Syobuzawa

Department of Clinical Pathology, Iwate Medical University

Chuichi Itoh

Department of Clinical Pathology, Iwate Medical University

Tomohisa Miyakawa

2nd Department of Internal Medicine, Iwate Medical University

Masataka Kato

2nd Department of Internal Medicine, Iwate Medical University

Tetsu Onishi

Heart Institute of Japan, Tokyo Women's Medical School

Hiroshi Kasanuki

Heart Institute of Japan, Tokyo Women's Medical School

Saichi Hosoda

Heart Institute of Japan, Tokyo Women's Medical School

For evaluating the spatial location of late potentials (LPs), the authors designed a new system for the body surface mapping of signal-averaged, filtered ECGs using forty-five thoracic unipolar leads (5 x 9 array). The signals from patients with old myocardial infarction (MI,N = 7) and arrhythmogenic right ventricular dysplasia (ARVD, N = 1) were amplified and passed through a bandpass (100-300 Hz) filter. The departure maps, LP isopotential maps, and LP₃₀ area maps were generated and superimposed. The LP₃₀ duration was determined as the section between the filtered QRS endpoints and points thirty milliseconds (ms) before. Isopotential maps of the LPs showed distinct positive and negative regions. In 7 cases with MI, the extreme was related to the zones indicated by the departure maps, and the LP₃₀ area maps also corresponded to the departure areas. In 1 case of ARVD, endocardial fragmented activity directly recorded at the right ventricle closely corresponded with the region on the LP₃₀ area map.

In conclusion, body surface LP isopotential maps and LP₃₀ area maps may provide useful information concerning the spatial distribution of endocardial fragmentation.

Angiology, Vol. 41, No. 8, 639-646 (1990)
DOI: 10.1177/000331979004100808


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