Introduction Quantitative coronary angiography (QCA) has played a crucial role in evaluating interventional techniques and assessing the results of new technologies.1 Beyond angiographic metrics, recently developed angiography-derived fractional flow reserve (FFR) may be a useful tool for diagnosing ischemia-producing lesions in patients with non-complex coronary artery disease.1,2 Meanwhile, although QCA metrics such as acute gain and late lumen loss proved to be instrumental in assessing...
