Normal ECG limits for Asian infants and children

Normal ECG limits are age-dependent, particularly in infants and children, and diagnostic ECG criteria are dependent on the availability of normal limits. As part of an ongoing study, we have evaluated selected ECG amplitudes and time intervals in a cohort of 1,166 healthy Chinese infants and children from Shanghai, China. We observe notable increases of QRS and QT intervals with age, a notable trend toward decreased R and increased S amplitudes in V2, and that T wave transition occurs at age 12 and that it occurs slightly earlier for males. We observe no notable gender differences in ECG parameters at age less than 12 years old, but that evolution differences begin to be manifested after age 8 years. The normal ECG limits in Asian infants and children are also compared with available data from North American infants and children