Electrophysiological mechanisms of the SI SII SIII electrocardiographic morphology

Prediction of ventricular tachyarrhythmia in Brugada syndrome by right ventricular outflow tract conduction delay signs

“…Spatial velocity ECG techniques showed that right ventricular conduction delay in the anterosuperior subpulmonary Purkinje network causes the appearance of SII > SIII patterns . Bayés de Luna et al.…”

Electrocardiographic manifestation of the middle fibers/septal fascicle block: a consensus report

“…This last hypothesis, the different distribution of Purkinje fibers, has been also used to explain the presence of S1 S2 S3 pattern in healthy people. 34 This explains why the ECG pattern remains unmodified during the long term. 33,34 c) In people with LV heart disease, especially LAD occlusion without lateral ischemia, the transient appearance of PAF may be explained by some type of VCD, block of the MF/SF, and/or some type of RBBB.…”