The Effect of Head Position on the Intubating Condition Using Fiberoptic Bronchoscopy

For better view of fiberoptic intubation, the posture of neck is compared between neck flexion and extension.

Inclusion Criteria:

• ASA class 1 or 2
• scheduled for general anesthesia with endotracheal intubation
• decided to join this clinical study voluntarily

Exclusion Criteria:

• history of difficult intubation
• anticipated the difficult intubation: Total airway score > 6, upper lip bite test grade III, with cervical spine disease, history of head or neck surgery
• risk of aspiration