In electrocardiography, left axis deviation (LAD) is a condition wherein the mean electrical axis of ventricular contraction of the heart lies in a frontal plane direction between -30° and -90°. This is reflected by a QRS complex positive in lead I and negative in leads aVF and II.
Video Left axis deviation
Cause
Common causes of LAD include left ventricular hypertrophy (LVH), left anterior fascicular block (or hemiblock) and inferior myocardial infarction. Less commonly LAD may be a normal variant, particularly in obese or stocky individuals, or it may be associated with Wolff-Parkinson-White syndrome or an ostium primum atrial septal defect.
LVH is generally recognised as a cause of LAD, although some sources claim that LVH does not cause LAD. Right sided accessory pathway in Wolff Parkinson white syndrome
Maps Left axis deviation
See also
- Right axis deviation
Right and left sided accessory pathway in Wolff-Parkinson White syndrome.
References
Source of article : Wikipedia
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