Practically speaking there are 2 dimensions in which electrodes can be placed... This record is called a ____ ___ ____ ____.

• A. Conventional 12 Lead EKG
• B. Modified Chest Left
• C. Standard Limb Leads
• D. Precordial Leads

Answer: (A)

Two practical dimensions for electrode placement come from using limb leads and chest (precordial) leads. Limb leads place electrodes on the arms and legs to view the heart in the frontal plane, while precordial leads place electrodes on the chest to view it in the horizontal plane. When you combine both sets, you obtain twelve different perspectives of the heart’s electrical activity, which is the conventional 12-lead EKG. The other options describe configurations that use only limb leads, only chest leads, or a modified setup, and don’t produce the full standard 12-lead recording.