Some general rules are available
RBBB -Morphology -LV origin
LBBB morphology -RV origin
Exceptions : Interventricular septum is electrically RV or LV ?
Electrically it is more of a LV . Septal focus often have RBBB morpholgy . Exist points do matter
Three lead approach
Rapidly looking at lead V1 , V6 and AVR can give us a clue
AVR +ve will immediately tell us the VPDs are firing towards right shoulder .
RBBB morphology points to a LV focus .
Negative VPD in V5 will further confirm LV apex is in the trailing end of VPD
Common sites for post MI VPD
Which VPD morphology has better localising value RBBB or LBBB ?
It is the LBBB that has more localising value . LBBB invariably fixes the right ventricle
RBBB can either be right ventricle or left ventricle .
To be continued .