Left axis deviation

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.^[1]

Cause

Common causes of LAD include left anterior fascicular block (or hemiblock) and inferior myocardial infarction.^[2]^[3] 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.

References

^ Jenkins, Dean (1996). "The electrical axis at a glance". www.ecglibrary.com. Retrieved 2016-11-12.
^ Lilly, Leonard (2006). Pathophysiology of Heart Disease. Lippincott Williams and Wilkins. ISBN 978-0-7817-6321-9.
^ Kasper D, Braunwald E, Fauci A, Hauser S, Longo D, Jameson J (2005). Harrison's Principles of Internal Medicine (16th ed.). McGraw-Hill. pp. 1314. ISBN 0-07-147760-8.

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[ecglibrary-1] Jenkins, Dean (1996). "The electrical axis at a glance". www.ecglibrary.com. Retrieved 2016-11-12.

[Lilly-2] Lilly, Leonard (2006). Pathophysiology of Heart Disease. Lippincott Williams and Wilkins. ISBN 978-0-7817-6321-9.

[Harrisons-3] Kasper D, Braunwald E, Fauci A, Hauser S, Longo D, Jameson J (2005). Harrison's Principles of Internal Medicine (16th ed.). McGraw-Hill. pp. 1314. ISBN 0-07-147760-8.

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[2]

[3]

Cause

See also

References