Resting electrocardiography (ECG) of a 67-year-old woman during a chest pain episode (A; ST-segment depression in leads II, III, aVF, and V4 through V6) and after pain resolution (B). Coronary angiography showed stenoses (arrows) at the origin of the left anterior descending artery (80%), in the left circumflex artery (90%; C), and in the right coronary artery (90%; D).