A Comparison of Cervical Spine Movement During Tracheal Intubation Using the Pentax or the Glidescope

Both Glide scope and Pentax laryngoscope are video laryngoscope that provide the better view with minimal cervical spine movement. This study wants to compare cervical spine movement during intubation when using these two devices. The C-spine motion will be recorded by using fluoroscopic video to measure the angular displacement of the vertebrae.

The primary outcome is the angular displacement of the vertebrae and secondary outcome is the hemodynamic changes after intubation.

Inclusion Criteria:

• ASA I-III
• Age 18-75 years old
• Elective noncardiac surgery requiring general anesthesia with tracheal intubation

Exclusion Criteria:

• Gastroesophageal reflux disease
• Body mass index greater than 35 kg/m2
• Possibility of pregnancy
• Previous neck surgery
• Unstable C-spine/ C-spine abnormality
• Known difficult airway
• Suspected difficult airway