Lewis lead
Lewis Lead
Lewis Lead (pronounced: LEW-is lead) is a specific configuration of Electrocardiogram (ECG) leads, named after the British cardiologist Thomas Lewis. The term "lead" in this context is derived from the Old English "lǣdan", meaning "to guide or direct", which is a reference to the lead's role in guiding the electrical signals of the heart.
Definition
A Lewis Lead is an alternative lead configuration used in Electrocardiography to better visualize certain heart rhythms, particularly atrial activity. It is often used to detect Atrial Flutter and other arrhythmias.
Configuration
The Lewis Lead configuration involves placing the right arm electrode on the manubrium (upper part of the sternum), the left arm electrode on the right chest below the clavicle, and the left leg electrode remains in its standard position. This configuration enhances the visibility of atrial activity on the ECG.
Usage
The Lewis Lead is particularly useful in the diagnosis of atrial flutter, a condition characterized by rapid and irregular beating of the atrial chambers of the heart. It can also be used to better visualize other arrhythmias and P waves.
Related Terms
- Electrocardiogram: A test that measures the electrical activity of the heartbeat.
- Atrial Flutter: A type of arrhythmia where the atria of the heart beat faster than the ventricles.
- Arrhythmia: A condition in which the heart beats with an irregular or abnormal rhythm.
- P wave: The first short upward movement of the ECG tracing, which represents the electrical impulse travelling through the atria.
External links
- Medical encyclopedia article on Lewis lead
- Wikipedia's article - Lewis lead
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