title: Removal of figure-8 knot in femoral-cerebral "headhunter IV" catheter during angiography.
mesh_terms: D001027:Aortography / Q000009:adverse effects; D002404:Catheterization / Q000009:adverse effects* / Q000295:instrumentation; D006801:Humans; D008297:Male; D008722:Methods; D008875:Middle Aged