Flashcards in Hemiblocks (Johnston) Deck (10):
What are some criteria for Left anterior hemiblock?
Left axis deviation (usually > -60)
Small Q in leads I and aVL, small R in II, III, and aVF
Usually normal QRS duration or slightly widened Q1S3 (Q in I and S in III)
In left anterior hemiblock, which leads will have small R waves?
II, III, aVF
In left anterior hemiblock which leads will have small Q waves?
I and aVL
Whats the axis deviation in left anterior hemiblock?
Left axis deviation
Look for I=up, aVF=down
What is the etiology of left posterior hemiblock?
Disease in conduction system
This is less common
What is the axis deviation in left posterior hemiblock?
Right axis (usually > or equal to 120 degrees)
In left posterior hemiblock, where do you have a small R?
Leads I and aVL
In left posterior hemiblock, where do you have a small Q?
Leads II, III, aVF
S1Q3 is associated with ___
Left posterior hemiblock