“…Almost all the major veins outside the thoracic cavity have been explored by clinicians as potential entry points for obtaining central venous access. For transvenous lead placement, the internal jugular vein, 9,13,14 the external jugular vein 10,38 the subclavian vein, 12,[39][40][41][42][43] the axillary vein, 18,22,25 the cephalic vein, 8,[44][45][46][47][48][49] the femoral vein, 50 and the iliac vein [51][52][53] have all been used. Of the many different options, the only two that are routinely used in clinical practice are the subclavian vein (and its direct continuation, the axillary vein) and the cephalic vein.…”