1. In this randomized controlled trial, the minimum stent area following percutaneous coronary intervention (PCI) was significantly higher with optical coherence tomography (OCT)-guided PCI than angiography-guided PCI. 2. There were no significant differences in target-vessel failure between OCT-guided PCI and angiography-guided PCI at two years. Evidence Rating Level: 1 (Excellent) Study Rundown: PCI is currently