Electrocardiography
Contiguity of leads

Each of the 12 ECG leads records the electrical activity of the heart from a different angle, and therefore align with different anatomical areas of the heart. Two leads that look at neighboring anatomical areas are said to be contiguous.

In addition, any two precordial leads next to one another are considered to be contiguous. For example, though V is an anterior lead and V is a lateral lead, they are contiguous because they are next to one another.
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