ECG changes in left bundle branch block (LBBB)
ECG findings:
- there is a Q in V1 and an R wave in V6 - there is depolarization of the right ventricle before the left. Thus despite the smaller muscle mass of the right ventricle, there is also an R in V1 and an S in V6. These changes may only appear as notches on the ECG.
- subsequent depolarisation causes an S in V1 and another R in V6.
Left bundle branch block is best seen in V6 where there is an M pattern. An M pattern may also be seen in I and AVL.
Related pages
Create an account to add page annotations
Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.