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Left QRS Axis
Criteria
- QRS axis < -30 °
- QRS axis >= -90 °
Causes
- Left Ventricular HypertrophyLeft axis deviation can be caused by left ventricular hypertrophy.
- Left Bundle Branch BlockLeft axis deviation can be caused by a left bundle branch block.
- Inferior ST ElevationLeft axis deviation can be caused by an inferior MI.
- Ventricular PacingLeft axis deviation can be caused by a ventricular pacemaker.
- Premature Ventricular ComplexLeft axis deviation can be caused by a ventricular ectopic beat.
- Wolff Parkinson White SyndromeLeft axis deviation can be caused by Wolff Parkinson White syndrome.
- Left Anterior Fascicular BlockLeft axis deviation can be caused by a left anterior fascicular block, which is the diagnosis of exclusion.
- Normal ECGLeft axis deviation can be caused by a horizontally orientated heart in a short, squat patient.
- Atrial Septal DefectLeft axis deviation can be caused by a Primum ASD.
Abbreviation
- Left Axis
Abbreviations
Synonyms
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