Transmural conduction velosity index in healthy schoolchildren

Transmural conduction velosity index (TCVI) was obtained in 174 healthy children. TCVI was defined as the echocardiographically determined interventricular septal thickness (IVST) divided by the ventricular activation time (VAT) measured by body surface potential mapping. TCVI ranged from 14 to 49 cm/sec and was highly correlated with IVST (r = 0.75, TCVI = 3.25 X IVST + 0.56). It was concluded that the left ventricular hypertrophy with muscular thickness does cause the greater conduction velosity in healthy children.