How many electrodes are used in a standard 12-lead ECG?

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Multiple Choice

How many electrodes are used in a standard 12-lead ECG?

Explanation:
The key idea is that the number of leads in a standard ECG is about how many views you get, not how many sensors you place. Ten physical electrodes are used: four on the limbs (two arms and two legs) and six on the chest (V1–V6). The right-leg electrode is typically a ground and isn’t used for measuring leads. From those ten electrodes, the device derives the 12 leads: the limb leads I, II, III and the augmented leads aVR, aVL, aVF come from the limb electrodes, while the chest leads V1–V6 provide six additional viewpoints. So, ten electrodes are used in the standard setup.

The key idea is that the number of leads in a standard ECG is about how many views you get, not how many sensors you place. Ten physical electrodes are used: four on the limbs (two arms and two legs) and six on the chest (V1–V6). The right-leg electrode is typically a ground and isn’t used for measuring leads. From those ten electrodes, the device derives the 12 leads: the limb leads I, II, III and the augmented leads aVR, aVL, aVF come from the limb electrodes, while the chest leads V1–V6 provide six additional viewpoints. So, ten electrodes are used in the standard setup.

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