Comparison of Three Techniques for Ultrasound-guided Internal Jugular Cannulation

"The physician will use an ultrasound machine to perform an ultrasound-guided internal jugular venous cannulation: the needle and the vein will be visualized in real time in the ultrasound image to make the cannulation process easier and safer.~In each one of three study arms, however, the ultrasound approach will be different depending on the axis on wich the vein is visualized (longitudinal, transversal or oblique) and the way the needle enters the ultrasound plane (in-plane or out of plane)."