ECG axis: Difference between revisions
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==Right Axis Deviation== | ==Right Axis Deviation== | ||
*Causes: | *Causes: | ||
**[[Right ventricular hypertrophy]] | **Usually accompanied by tall R wave in V1 | ||
**[[Pulmonary hypertension]] & chronic lung disease | ***[[Right ventricular hypertrophy]] | ||
***[[Pulmonary hypertension]] & chronic lung disease | |||
**[[COPD]] | **[[COPD]] | ||
**[[Pulmonary embolism]] | **[[Pulmonary embolism]] | ||
Revision as of 08:54, 11 April 2017
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:
- Usually accompanied by tall R wave in V1
- Right ventricular hypertrophy
- Pulmonary hypertension & chronic lung disease
- COPD
- Pulmonary embolism
- Left posterior fascicular block
- Lateral MI (from Q-waves in lead I)
- Ventricular ectopy (VT)
- TCA toxicity, sodium channel blocker toxicity
- Hyperkalemia
- Lead misplacement
- Dextrocardia
- Normal thin adults with horizontally positioned hearts
- Usually accompanied by tall R wave in V1
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}}