Abstract
A method is presented for the production of isopotential surface maps in children. After recording from 150 to 250 points over the body, the data were processed for analysis by a digital computer with the output of an instantaneous surface map for approximately every millisecond. The presence of dipolar and nondipolar distribution of body surface potentials varied throughout QRS; however, the children demonstrated considerably more of a nondipolar distribution than found by Taccardi in adults. Direct evidence was obtained relating the development of a central minimum over the sternum to epicardial breakthrough of wave fronts in the right ventricular free wall. These studies add emphasis to the need for the further accumulation of data in patients with normal and abnormal hearts to define the time course and location of electrical events on the body surface, since important information is available in areas not sampled by conventional electrocardiographic lead systems.
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