Normal limits of derived vectorcardiogram in Chinese

Derived vectorcardiograms from 503 healthy Chinese individuals (248 men and 255 women) were analyzed to determine the normal ranges of scalar and vector measurements in a Chinese population. In both sexes, the magnitude of the maximal spatial QRS and T vectors decreased significantly with age and was significantly smaller in women in all age groups. The results of this study were concordant with the results of previous studies using the Frank lead system in Caucasians, but the derived vectorcardiogram has the advantage of not requiring any leads additional to those used for recording the conventional 12-lead electrocardiogram. In conclusion, it was found that for healthy Chinese individuals there are significant age and sex related influences on the normal ranges of derived vectorcardiograms. Therefore, vectorcardiographic diagnostic criteria for Chinese individuals should be age-related and sex-related.