Experiments were performed to test the validity of representing the bipolar electrogram as the algebraic sum of two monophasic curves and the validity of Wilson's concept of the significance of the area, AQRS plus AT. An electronic integrator was employed to measure the areas of bipolar leads recorded from a strip of turtle ventricle which could be stimulated at either end. The close correspondence of the experimental findings with the predictions derived from the representation of the bipolar curve as the algebraic sum of two theoretical monophasic curves supports the validity of the concept tested.

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