ECG axis

• If up in leads 1 and AVF then normal axis

Right Axis Deviation

Causes

1. Right ventricular hypertrophy
2. Pulmonary HTN - Acute (PE) & chronic lung disease (COPD)
3. Left posterior fascicular block
4. Lateral MI (from Q-waves in lead I)
5. Ventricular ectopy (VT)
6. Hyperkalemia
7. Lead misplacement
8. Dextrocardia
9. Normal thin adults with horizontally positioned hearts​

Left Axis Deviation

Causes

1. Left anterior fascicular block
2. Left Bundle Branch Block
3. Inferior MI
4. Left Ventricular Hypertrophy

See Also

• ECG (Main)