 What we did was we injected approximately 4 mL of Visipaque 320 contrast material through the introducer and did a mapping venogram and it turned out that the cephalic vein was joining into the subclavian vein. 
What we did was we injected approximately 4 mL of Visipaque 320 contrast material through the introducer and did a mapping venogram and it turned out that the cephalic vein was joining into the subclavian vein .