Spatial Vector Magnitude
Spatial QRS vector magnitude · age-dependent fitted limits
Cardiology.org · ECG reference model
Extreme Percentile ECG Variables
Select sex and enter age to calculate fitted 1st, 2nd, 98th, 99th percentiles for Spatial Vector Magnitude (SVM), Sokolow–Lyon Score (SL), and QRS Duration.
years
Sex
1234 years
microvolts (µV)
Sokolow–Lyon Score (SL)
max(RV5, RV6) + |SV1| · age-dependent fitted limits
QRS Duration
QRS duration · age-dependent fitted limits