Final answer:
The leads that show changes in an MI in the left circumflex coronary artery are typically lead I, aVL, V5, and V6.
Step-by-step explanation:
The left circumflex (LCX) coronary artery supplies blood to the left side of the heart. It follows the coronary sulcus to the left and eventually fuses with the small branches of the right coronary artery. The leads that show changes in an MI (myocardial infarction) in the left circumflex coronary artery are typically lead I, aVL, V5, and V6.