Figure 143

A.Normal signal- averaged vector complex.
B.Abnormal signal-averaged vector compex. All three SAECG measurements are abnormal.The signal-averaged QRS duration is 187ms, low amplitude signals are 103ms. in duration, and the root-mean- square voltage is2.2mircoV.

Reference:Walter,P.,MD,Hurstís The Heart,8th Edition,Technique of Signal- Averaged Electrocardiography,pp.893-896.