Left Axis Deviation
Causes of left axis deviation
- Advanced age
- LVH
- Obesity
- Emphysema
- Inferior MI (loss of inferior forces)
- Left anterior fascicular block (LAFB); diagnostic criteria:
- left axis deviation > - 45 degrees
- leads I and aVL but start with a narrow Q (qR)
- leads II, III, aVF but start with a small r (rS)
- QRS may be slightly widened but < 0.12s