Table 1

Anatomic considerations for transradial catheterization

Anatomic variantIncidenceImportanceReference
Radial artery loop1% (n=997)Can cause artery avulsion if straightened; increases conversion from radial to femoral access26
High origin of the radial artery/'brachioradial artery'9.2% (n=120)Increases risk of spasm due to small size of artery, can risk dissection when exchanging from a hydrophilic to stiff guidewire22
Aberrant right subclavian artery0.47% (n=6833)Difficulty entering the ascending aorta when using a transradial approach31
Tortuous right brachiocephalic artery25% (n=52)Increases difficulty in vessel selection due to loss of distal catheter control in tortuous vessel32
Bovine aortic arch13.6% (n=23 882)Eases catheterization of left common carotid artery from right transradial approach, may increase difficulty of left common carotid artery catheterization from transfemoral approach32