Cardiac arrhythmias in healthy children revealed by 24-hour ambulatory ECG monitoring

Ambulatory electrocardiographic monitoring was performed on 360 healthy children, from newborn infants to junior high school students. They were divided into five groups by age: group A, 63 newborn infants on the first day of life; group B, 50 infants aged 1–11 months; group C, 53 kindergarten pupils aged 4–6 years; group D, 97 primary school pupils aged 9–12 years; and group E, 97 junior high school students aged 13–15 years.