Normal Frank vectorcardiogram in infancy and childhood.

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Abstract
Qualitative and quantitative analysis of the vectorcardiogram as recorded with the Frank lead system was described in 175 normal subjects varying in age from 1 day - 15 years. The subjects were divided into 3 groups: Group I, 29 infants under 2 months, Group II, 46 infants from 2-11 months, Group HI, 100 children from 1-15 years. A significant difference in the orientation and magnitude of successive instantaneous time QRS vectors was found in the different age-groups. The evolution of the spatial QRS-T angle with ageing was described.