Figure 2 US-guided CVAD technique. (a) US demonstration of internal jugular vein and common carotid artery. (b) Insertion of CVC guided by US. (c) Venous blood aspirated after puncturing the vein. (d) Chest radiogaph PA view for confirmation to the site of CVC. CVAD, central venous access device; CVC, central venous catheter; PA, posterioanterior; US, ultrasound.