Final answer:
The 3-electrode system can be modified to evaluate anterior wall ischemia by analyzing the lead II potential. This involves placing electrodes on specific locations on the chest. Changes in the lead II potential can indicate a lack of blood flow to the front part of the heart, which is known as anterior wall ischemia.
Step-by-step explanation:
The 3-electrode system can be modified to evaluate anterior wall ischemia by placing three electrodes on the chest in specific locations. The standard ECG setup includes electrodes on the left and right arms and the left leg. The voltage between the right arm and the left leg, known as lead II potential, is often graphed and can indicate heart-muscle function. By analyzing changes in the lead II potential, doctors can identify anterior wall ischemia, which is a lack of blood flow to the front part of the heart.