: What is the significance of the right lower node in a 12-lead electrocardiogram placement? Given this EKG limb leads image, I noticed that the function of the right leg node in a 12-lead ecg/ekg is missing. In an actual

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What is the significance of the right lower node in a 12-lead electrocardiogram placement?
Given this EKG limb leads image, I noticed that the function of the right leg node in a 12-lead ecg/ekg is missing.

In an actual placement I know this is present.

So I need to ask, what is the significance of this node?
Does it serve as an electrical ground?

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