Optimal Length of Pre-inserted ETT for Nasal Fiber Optic Intubation

Optimal Length of the Pre-inserted Endotracheal Tube for Obtaining Good View of Laryngeal Opening for Nasal Fibreoptic Intubation

This study is intended to find the optimal length of pre-inserted ETT for nasal fiberoptic intubation and the equation to predict it.

Inclusion Criteria:

• ASA physical status I-II
• aged 20-65 yr (adults)

Exclusion Criteria:

• rhinitis
• bleeding diatheses
• requirement of awake intubation
• a previous major oral and maxillofacial surgery history
• anatomical deformity of the face, neck and upper airway