Accurate determination of coronary reference size is essential for optimal stent selection and evaluation of stent expansion during percutaneous coronary intervention (PCI). Several approaches for reference size estimation have been published with no universal agreement. The aim of this study was to investigate if potential differences in coronary reference size estimation lead to differences in stent and balloon selection and in detection of stent under expansion. Definitions for coronary reference size estimation, stent size selection, and stent expansion were identified in 17 randomized controlled trials. The identified methods were applied in a population of 32 clinical cases. Reference size estimates ranged up to 1.35mm, and indicated nominal stent size ranged up to 1.0 mm in the same case depending on method. Mean relative stent expansion ranged from 54±12% to mean 100±29% depending on the applied reference method. Choice of method for reference size estimation using intravascular imaging may influence stent selection and greatly affects evaluation of post-PCI stent expansion.

准确确定冠状动脉参考尺寸对于经皮冠状动脉介入治疗 (PCI) 期间的最佳支架选择和支架扩张评估至关重要。已经发布了几种参考尺寸估计方法，但尚未达成普遍共识。本研究的目的是调查冠状动脉参考尺寸估计的潜在差异是否会导致支架和球囊选择以及扩张下支架检测的差异。 17 项随机对照试验确定了冠状动脉参考尺寸估计、支架尺寸选择和支架扩张的定义。确定的方法应用于 32 个临床病例。参考尺寸估计范围最大为 1.35 毫米，在相同情况下，根据方法的不同，标称支架尺寸范围最大为 1.0 毫米。平均相对支架扩张范围为 54±12% 至平均 100±29%，具体取决于所采用的参考方法。使用血管内成像估计参考尺寸的方法的选择可能会影响支架的选择，并极大地影响 PCI 后支架扩张的评估。