PEDIATRICS Vol. 5 No. 3 March 1950, pp. 396-407
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ELECTROCARDIOGRAM IN 679 HEALTHY INFANTS AND CHILDREN

MARGARET MARONEY M.D.1 and LOWELL A. RANTZ M.D.2

1 The Department of Pediatrics, Stanford University School of Medicine, San Francisco, Calif.
2 The Department of Medicine, Stanford University School of Medicine, San Francisco, Calif.

An ECG was taken on each of 683 apparently healthy children. Flat, inverted or diphasic T or P waves never occurred in Lead I, rarely occurred in Lead II and frequently occurred in Lead III.

The QRS interval tends to be shorter in children than in adults and increases with age from 6 months to 9 years. Measurements less than 0.04 sec. or greater than 0.08 sec. are rare in healthy children under the age of 9 years.

The PR (PQ) interval tends to be shorter in children than in adults and increases with age from 6 months to 9 years. PR (PQ) intervals of 0.15 sec. or more are rare in healthy children under the age of 4 years. PR (PQ) intervals of 0.16 sec. or more are very rare in healthy children from 4 to 9 years of age.

Submitted on June 24, 1949


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