Background Despite the clinical benefits to intravascular ultrasound (IVUS) guidance for percutaneous coronary intervention (PCI), most patients with coronary artery disease undergo angiography‐guided PCI alone in the real‐world setting. We sought to investigate the procedural characteristics of IVUS‐guided PCI and their clinical outcomes, as compared with angiography‐guided PCI. Methods and Results This was a cohort study using patient‐level data from the IVUS‐XPL (Impact of Intravascular Ultrasound Guidance on the Outcomes of Xience Prime Stents in Long Lesions) and ULTIMATE (Intravascular Ultrasound Guided Drug Eluting Stents Implantation in All‐Comers Coronary Lesions) clinical trials. A total of 2848 patients with 3872 native coronary lesions were included and procedural characteristics assessed by quantitative coronary angiography (QCA) were compared between IVUS and angiography guidance. Stent‐to‐reference vessel diameter ratio (ie, QCA stent sizing) was greater (1.11±0.16 versus 1.07±0.14, P
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