William Morrow in Bundle Branch Block


You can distinguish between LBBB (Left Bundle Branch Block) and RBBB (Right Bundle Branch Block) simply by looking at the QRS morphology in V1 and V6.

If the QRS looks like W in V1 and M in V6 it is LBBB. (WiLLiaM)

If the QRS looks like M in V1 and W in V6 it is RBBB. (MoRRoW)

5 comments:

  1. AnonymousSeptember 2, 2009 at 7:49 PM

    tahnks!

    ReplyDelete
  2. AnonymousApril 21, 2010 at 1:02 PM

    Never heard the william/morrow thing before, I love it. Thanks for sharing!

    ReplyDelete
  3. AnonymousJanuary 9, 2014 at 4:20 PM

    only really works for a complete block

    ReplyDelete
  4. AnonymousJuly 13, 2014 at 3:12 PM

    Clear and easy example , Thank you

    ReplyDelete
  5. AnonymousNovember 3, 2014 at 5:15 AM

    Very interesting as this was my grandfathers name. Will never forget it now!

    ReplyDelete

Thank you for your time.