The normal values of spatial velocity in the second part of QRS (A cooperative study of 229 healthy individuals)

The Spatial Velocity (SV) represents the inscription velocity from spatial vectors of the QRS loop. According to Sano, this parameter has revealed a diagnostic capacity for some well defined pathologies. Using hellerstein and Hamlin's formula, the SV has been determined from the orthogonal Frank leads in a 250 mm/sec recording. Using Simonson's criteria, 229 normal individuals, arranged in seven groups according to age and sex, were used in an attempt to get normal values for the second half of the QRS loop. SV was determined in six time intervals of 2.5 msec from the 25 msec vector before the end of QRS. We found significant differences between the values obtained from each time interval, except in the 35–37.5 msec and 37.5–40 msec vectors. On the other hand, no significant differences were found among the normal individual groups. The 96th percentile distribution was used to get the normal extreme values in the entire group of individuals.