Where is the LA (left arm) electrode placed?

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Multiple Choice

Where is the LA (left arm) electrode placed?

Explanation:
The LA electrode is placed on the left arm. In a standard ECG, limb electrodes are placed on the right arm, left arm, and left leg (with a separate right-leg electrode used as a ground). Positioning the left-arm electrode here allows measurement of electrical activity from that side and contributes to the various limb leads, such as Lead I and the augmented limb lead aVL, which rely on the potentials detected by the left arm. Placing it elsewhere, like on the leg, would change the vector orientation and lead readings.

The LA electrode is placed on the left arm. In a standard ECG, limb electrodes are placed on the right arm, left arm, and left leg (with a separate right-leg electrode used as a ground). Positioning the left-arm electrode here allows measurement of electrical activity from that side and contributes to the various limb leads, such as Lead I and the augmented limb lead aVL, which rely on the potentials detected by the left arm. Placing it elsewhere, like on the leg, would change the vector orientation and lead readings.

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