The Cuff Pressure of an Endotracheal Tube After Supine-to-lateral Position Change

Comparison of the Cuff Pressure of an Endotracheal Tube After Supine-to-lateral Position Change: Barrel-shaped vs. Taper-shaped Cuff

To compare the cuff pressure in lateral position between barrel-shaped cuff and taper-shaped cuff

The position of endotracheal tubes depends on the position of the patients. The change of the tube's position is known to influence the pressure of tube's cuff. The shape of the cuff (barrel-shaped versus tapered-shaped) may affect the tube's migration degree because of the difference of the frictional force.

The investigator try to compare the the cuff pressure after supine-to-lateral position change between barrel-shaped cuff and taper-shaped cuff.

Inclusion Criteria:

• Patient scheduled for nephrectomy in lateral decubitus position

Exclusion Criteria:

• Pregnancy
• Patients with difficult airway
• Patients with neck motion disorder
• Patients with history of neck surgery
• Patients with history of oral and pharyngeal surgery
• Patients with body mass index > 35
• Patients without teeth