There are two methods of the central venous catheterization in terms of visualization. First and older is the blind technique. The operator is locating the anatomical landmarks and then performing the entire procedure blindly by percutaneous puncture. This is called the landmark technique. Second and new is the ultrasound-guided technique. The operator is locating the vein using ultrasonography and then performing the entire procedure under ultrasonographic visualization. The real time ultrasound-guided central venous catheterization became the standard of care in recent years mainly because of safety issues (is regarded as safer than landmark technique)