Anatomic considerations for transradial catheterization
| Anatomic variant | Incidence | Importance | Reference |
| Radial artery loop | 1% (n=997) | Can cause artery avulsion if straightened; increases conversion from radial to femoral access | 26 |
| 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 guidewire | 22 |
| Aberrant right subclavian artery | 0.47% (n=6833) | Difficulty entering the ascending aorta when using a transradial approach | 31 |
| Tortuous right brachiocephalic artery | 25% (n=52) | Increases difficulty in vessel selection due to loss of distal catheter control in tortuous vessel | 32 |
| Bovine aortic arch | 13.6% (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 approach | 32 |