Two approaches are possible when the first finder needle attempt of the internal jugular vein cannulation fails; the needle can be turned slightly laterally or the puncture point can be moved slightly medially. This study is an ultrasonographic stimulation study to evaluate the success rate of turning the needle laterally and moving the puncture point medially, and to determine the proper angle or distance for the second try of internal jugular vein cannulation.
Patients scheduled for general anesthesia
Refusal of consent
Patients with C-spine injuries
Patients with atlanto-axial instability
Patients at risk of increased intracranial pressure