Western Maricopa Education Center (West-MEC) RMA-AMT Module 3 Practice Test

Lead #3 is placed at which anatomical location in the described placements?

2nd intercostal space below the middle of the right clavicle Left lower rib cage nonmuscular spot 2nd intercostal space below the middle of the left clavicle 4th intercostal space right side

Correct Answer:

2nd intercostal space below the middle of the left clavicle

Explanation:

The placement being tested is the left chest position for a lead, specifically in the second intercostal space just below the middle of the left clavicle. This spot places the electrode over the upper left portion of the heart, which is how Lead 3 is described in this set of placements. It provides a different viewing angle of the heart’s electrical activity compared with leads placed on the right side or lower on the chest. The other options place an electrode on the right side, or lower on the chest, or in a position that corresponds to a different lead orientation, so they don’t fit the described lead sequence.

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