ECG axis: Difference between revisions
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**Lateral MI (from Q-waves in lead I) | **Lateral MI (from Q-waves in lead I) | ||
**Ventricular ectopy (VT) | **Ventricular ectopy (VT) | ||
**Hyperkalemia | **[[Hyperkalemia]] | ||
**Lead misplacement | **Lead misplacement | ||
**Dextrocardia | **Dextrocardia | ||
Revision as of 18:31, 24 September 2016
Normal Axis
- -30°→90°
- Dominant QRS direction (positive or negative) can be used to approximate axis
- Normal axis if positive QRS in leads I and aVF
Right Axis Deviation
- Causes:
- Right ventricular hypertrophy
- Pulmonary hypertension - Acute (PE) & chronic lung disease (COPD)
- Left posterior fascicular block
- Lateral MI (from Q-waves in lead I)
- Ventricular ectopy (VT)
- Hyperkalemia
- Lead misplacement
- Dextrocardia
- Normal thin adults with horizontally positioned hearts
Left Axis Deviation
- Causes:
- Left anterior fascicular block
- Left Bundle Branch Block
- Inferior MI (from Qs)
- Left Ventricular Hypertrophy
- Pacer
- WPW
- Hyperkalemia
- Normal variant
See Also
Video
{{#widget:YouTube|id=grFic4Gb0zA}}