Figure 1 Patient selection into this study with a case example. Figure represents a case from our study of a 72-year-old man who was admitted to our center with acute chest pain. Electrocardiography confirmed an inferior ST-elevation myocardial infarction (A). Coronary angiography revealed a total occlusion of the right coronary artery (B), and the patient underwent an index culprit lesion percutaneous coronary intervention (PCI) to restore blood flow in the occluded artery (C). Coronary angiography also identified an approximately 75% stenosis in the left anterior descending artery (LAD) (white arrowhead) (D). A quantitative flow ratio of the LAD was performed, yielding a result of 0.74, indicating that the stenosis was hemodynamically significant (E). The LAD was treated during a staged procedure 3 months after the index PCI (F).