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Multipolar recording technics have been employed to record the spread of excitation through the wall of the ventricle. The construction of isochronous planes in a block of tissue aids in visualizing the direction of spread. The results give direct support to the idea of fast endocardial spread followed by syncytial spread through the wall at a slower rate. No evidence is found that the impulse spreads through the individual cardiac muscle bundles.
Scher et al. (Sun,) studied this question.