Our purpose in undertaking this work is threefold: to establish trustworthy criteria for the normal electrocardiogram of the child, to determine how and to what extent the child's electrocardiogram deviates from the normal in the various types of heart disease (part II) and to compare the measurements of the child with those of the adult, for which accurate criteria are available.
REVIEW OF THE LITERATURE
The first electrocardiographic study of children was made by Nicolai and Funaro,1 in 1908. They recorded the standard lead I for 45 infants and children and noticed the frequent occurrence of a deep S wave in this lead. This finding they ascribed either to hypertrophy of the left ventricle or to a more transverse position of the infant's heart than of the adult's heart. However, they failed to mention whether all the children studied were normal.The same finding of a deep S wave