Catheter in right side of neck after bypass surgery which vessel is it going into ?

Int. Jugular vein IJ: The indications for internal jugular vein (i.J.) central line: 1. Central venous access for infusion of vasoactive drugs, tpn, high dose kcl, etc. 2. Hemorrhagic disorder where large volumes blood/blood products needed 3. Measurement of central venous pressure 4. Need for frequent blood draws where peripheral access limited. 5. Lack of peripheral venous access.

Probably right inter: The right internal jugular is the most common vein accessed for cardiac procedures.