ECG axis: Difference between revisions
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==External Links== | ==External Links== | ||
* [http://ddxof.com/ecg-guide/ DDxOf: ECG Guide] | *[http://ddxof.com/ecg-guide/ DDxOf: ECG Guide] | ||
==References== | ==References== | ||
Revision as of 15:51, 4 July 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 HTN - 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
- Left Ventricular Hypertrophy
See Also
Video
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