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 | ***[[Right ventricular hypertrophy]] | ||
**Left posterior fascicular block | ***[[Pulmonary hypertension]] & chronic lung disease | ||
**[[COPD]] | |||
**[[Pulmonary embolism]] | |||
**[[Left posterior fascicular block]] | |||
**Lateral MI (from Q-waves in lead I) | **Lateral MI (from Q-waves in lead I) | ||
**Ventricular ectopy (VT) | **Ventricular ectopy (VT) | ||
**[[TCA toxicity]], sodium channel blocker toxicity | |||
**[[Hyperkalemia]] | **[[Hyperkalemia]] | ||
**Lead misplacement | **Lead misplacement | ||
| Line 33: | Line 37: | ||
==See Also== | ==See Also== | ||
*[[ECG (Main)]] | *[[ECG (Main)]] | ||
==External Links== | ==External Links== | ||
Latest revision as of 22:13, 27 March 2024
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