ABSTRACT Background The radial approach has been increasingly used worldwide for diagnostic and therapeutic cardiac catheterization. The radial artery caliber is one of the limitations of its use. The objective of this study was to describe the anatomy of the radial and ulnar arteries, as well as to develop a radial artery diameter prediction score using clinical and anthropometric criteria. Methods Using vascular ultrasound with bilateral radial and ulnar artery measurements, 1,180 patients who underwent cardiac catheterization or angioplasty procedures […]