Objective: To define the distribution of the cardiac electric field around the isolated heart of guinea pig.
Methods: The hearts of 26 guinea pigs were isolated and immersed in normal saline or distilled water, and the ECGs were recorded in 4 directions of every plane with 4 points deposited in every direction at different distances from the anterior, posterior and the laterals of both the ventricles of the heart.
Result: In both media, ECGs were composed mainly of upright waves were recorded at all points in the 4 directions at the 3 levels.
Conclusion: The uniformed outward distribution of the cardiac electric field suggests that it is not dipolar but a sphere-like single source when the interference of different potentials of the reference points over the body surface is excluded.
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