Left axis deviation
Left Axis Deviation
Left Axis Deviation (LAD) is a term used in Electrocardiography to describe the electrical activity of the heart. It is a type of Cardiac Axis deviation and is often associated with conditions such as Left Ventricular Hypertrophy and Left Anterior Fascicular Block.
Pronunciation
- Left Axis Deviation: /lɛft ˈæksɪs dɪˈveɪʃən/
Etymology
The term "Left Axis Deviation" is derived from the medical terminology used to describe the direction of the electrical activity of the heart. "Left" refers to the direction of the deviation, "Axis" refers to the electrical axis of the heart, and "Deviation" refers to the change from the normal axis.
Definition
Left Axis Deviation is defined as a condition where the mean electrical axis of the heart is deviated to the left of the normal axis. This is usually indicated by a QRS complex in lead I and aVL that is predominantly negative in lead II.
Related Terms
- Electrocardiography: The process of recording the electrical activity of the heart over a period of time using electrodes placed on the skin.
- Cardiac Axis: The mean direction of the electrical activity of the heart during the cardiac cycle.
- Left Ventricular Hypertrophy: A condition characterized by the thickening of the left ventricular wall of the heart.
- Left Anterior Fascicular Block: A condition where there is a block in the anterior fascicle of the left bundle branch, leading to a delay in the electrical conduction.
See Also
External links
- Medical encyclopedia article on Left axis deviation
- Wikipedia's article - Left axis deviation
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