This EKG shows an acute inferior infarct (Q waves and S-T segment elevation in II, III, and aVF) as well as an acute posterior wall infarct (prominent R waves and S-T segment depression in V1-V3). This patient had a 100% occlusion of the right coronary artery (RCA) and got a stent. 85% of people have a dominant RCA that serves the posterior wall of the heart. In this paitent you would want to look at right sided chest leads, and S-T elevation in V3 and V4 on the right would indicate right ventricle infactrion (also served by the RCA). Patients with RV infarcts tolerate reduction in preload poorly, so nitrates shold be avoided.