Bundle Branch Block Determination III - Complete Bundle Branch Block .
Please sign in. This module is premium content.
Analyze the terminal portion of the QRS complex. Starting at the “J” point go one small box back into the QRS (moving to the left).
- If the energy is below the isoelectric line, this is a left BBB.
- If the energy of the depolarization is above the isoelectric line, this is a right BBB.
- some people refer to a turn signal: down is left, up is right
Authors and ReviewersAuthored by Thomas O'Brien
Medically reviewed by Dr. Jonathan Keroes, MD, Cardiology
Last Update: 11/8/2020