<qa>  What is the main disadvantage of radial access?Vascular access site complications VASC during cardiac catheterizations are significantly higher in transfemoral access compared to transradial access. Patient comfort and shorter length of stay are additional advantages favoring radial access, contributing to the trend of increasing adoption of radial access for cardiac catheterizations. Main disadvantage in radial access is the restriction in size of catheters related to smaller caliber of radial artery as well as incidence of radial artery spasm, which can adversely affect patient satisfaction as well as procedural success often leading to conversion to femoral access. Additionally, increased adoption of radial access has led to reduced familiarity with femoral access among radial only or radial first operators resulting in higher complication rate during femoral access compared to historical complication rates Campeau paradox. Several measures to reduce radial artery spasm and increase procedural success have been studied. 