Table 2. Brief Summary of Failed Cases.

Sex	Age	Indication of intervention	Approach	Reason for TRA	Sheath	Guiding catheter	Procedure time (min.)	Cause of failure	Complication
F	62	Right PCA mycotic aneurysm	TRA	Tortuous vascular system	5 Fr	5 Fr	102	Too acute angulation of the vessel for microcatheter to pass	No
M	49	Right VB junction occlusion	TRA	Tortuous vascular system	5 Fr	5 Fr	33	Failure of guidewire passage due to organized occlusion	No
M	74	Innominate arter occlusion	TRA	Tight stenosis very close to aortic arch	5 Fr	4 Fr	46	Failure of guidewire passage due to organized occlusion	No

TRA, transradial approach; TFA, transfemoral approach; TBA, transbrachial approach