In a standard 12-lead ECG, how many wires are typically used?

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Multiple Choice

In a standard 12-lead ECG, how many wires are typically used?

Explanation:
Think in terms of how many skin electrodes are actually connected to the patient. A standard 12-lead ECG uses six chest electrodes (V1–V6) and four limb electrodes placed on the arms and legs. The electrode on the right leg acts as a ground/reference and isn’t used to derive a lead. So you have 10 physical electrodes wired to the patient, and the machine uses combinations of those 10 to produce the 12 leads. That’s why the typical setup involves ten wires.

Think in terms of how many skin electrodes are actually connected to the patient. A standard 12-lead ECG uses six chest electrodes (V1–V6) and four limb electrodes placed on the arms and legs. The electrode on the right leg acts as a ground/reference and isn’t used to derive a lead. So you have 10 physical electrodes wired to the patient, and the machine uses combinations of those 10 to produce the 12 leads. That’s why the typical setup involves ten wires.

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