Transradial approach of cardiac catheterization is a common alternative to transfemoral access for diagnostic coronary angiography and percutaneous coronary interventions (PCI). The transradial approach reduces access site bleeding complications and the procedural discomfort of the patients. Transradial procedures may be performed by cannulation of the right or left radial artery and at present, the choice of the right or left radial artery depends largely on the operator' s preference.