The brief physiologic devolution of the ECG requires knowledge of the normal values for each age group. However, the normal range varies greatly.
The configuration of ECG tracings peculiar to children may be unfamiliar to a doctor predominantly working in adult cardiology.
Extracardiac factors play a much greater part in children than in adults; they vary from age group to age group and, are often difficult to differentiate.
Recording of faultless tracings meets with purely technical difficulties, especially in young children: artifacts due to restlessness, crying, slipping of electrodes, etc., must be taken account of in interpretation.
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