- Left axis deviation
- Small q waves with tall R waves in leads I and aVL
- Small r waves with deep S waves in leads II, III, aVF
- QRS duration is normal or slightly prolonged (80-110 ms)
- Prolonged R wave peak time in aVL > 45 ms (measure from start of Q to peak of R)
- Increased QRS voltage in the limb leads
Dr. Burns also provides a beautiful pearl that in LAFB you might see LVH voltage criteria in aVL (R wave height > 11 mm), but there will be no LV strain pattern.