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[Development of the maximal dipole moment of the heart with respect to postnatal heart growth].

The maximal dipole moment of the heart of various species shows a proportionality to the heart weight. The present study investigates whether this relation is also valid for the postnatal period. The Nelson-lead-system separates the influence of the heart growth from that of the body growth. It allows to calculate the resultant dipole moment of the heart. Our experiments were applied to guinea pigs. The postnatal increase of the body weight and heart weight and the development of the dipole moment were obtained for the first 25 d of life. The results show a linear increase of the body weight with age. In contrast, the resultant dipole moment of the heart is almost constant during the first 14 d of life. Only after the 2nd week of life, the maximal dipole moment increases with further age. Evidently, during the first 14 d of the postnatal development other important factors than the growing heart mass influence the magnitude of the dipole moment.