Final answer:
The reciprocal changes of a posterior myocardial infarction are evident in leads II, III, and aVF, which tend to show changes opposite to the site of infarction due to their position on the electrocardiogram.
Step-by-step explanation:
The reciprocal changes of a posterior myocardial infarction (MI) are evident in which leads? The correct answer is A. II, III, aVF. The posterior interventricular artery, also known as the posterior descending artery, branches from the right coronary artery. It supplies the interventricular septum and portions of both ventricles. During a posterior MI, leads II, III, and aVF are the inferior leads on an electrocardiogram (ECG) and tend to show the reciprocal changes, which refer to the ECG changes that occur opposite of the actual site of infarction because these leads view the heart from the opposite side. Reciprocal changes may include ST-segment depression and/or T-wave inversion, which are indicative of ischemia in the area opposite to the actual site of myocardial injury.