Where is the RA (right arm) electrode placed for a standard 12-lead ECG?

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Multiple Choice

Where is the RA (right arm) electrode placed for a standard 12-lead ECG?

Explanation:
The right arm is used for the RA electrode because limb-lead ECGs derive their signals from electrodes placed on the limbs. Putting the RA electrode on the right arm (often on the wrist or upper arm) provides one pole for the limb leads, helping form Leads I, II, III and the augmented leads (aVR, aVL, aVF). The other limb electrodes go on the left arm and legs, while a ground/reference electrode is typically placed on a leg. This arrangement gives the standard frontal-plane view and the full 12-lead set.

The right arm is used for the RA electrode because limb-lead ECGs derive their signals from electrodes placed on the limbs. Putting the RA electrode on the right arm (often on the wrist or upper arm) provides one pole for the limb leads, helping form Leads I, II, III and the augmented leads (aVR, aVL, aVF). The other limb electrodes go on the left arm and legs, while a ground/reference electrode is typically placed on a leg. This arrangement gives the standard frontal-plane view and the full 12-lead set.

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