A Fourier technique for simultaneous electrocardiographic surface mapping

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Abstract
A method for the preparation of isopotential maps derived from thoracic surface electrocardiograms is described. Electrodes incorporating amplifiers are arranged in three rows of eight around the thorax, and are sampled simultaneously. The subsequent digital processing of the signals uses Fourier transforms to determine the potentials at the thoracic sites between the electrodes. The maps are automatically plotted at 2-msec intervals throughout the cardiac style.