This study is designed to investigate the relationship between patients' position and endotracheal tube intracuff pressure in the pediatric population.

There are currently no data in the literature as to the effect of changes in head position on CP. As the cuff is located in the patients' trachea, the shape of the patents' trachea may be change depending on the position of the patient's head and therefore, the CP may also change. If the intracuff pressure will increase as the patient's head is moved into a flexed or extended position, these patients may be at risk for tracheal damage. The investigators will prospectively evaluate the relationship between the patient's head position and CP in patients undergoing otolaryngological surgery.

Inclusion Criteria:

• Age less than 18 years
• Undergoing otolaryngological surgery with endotracheal intubation

Exclusion Criteria:

• Patient who is intubated with an uncuffed endotracheal tube
• Patients who have a limitation for movement of the neck or concerns of the stability of the cervical spine

Patients undergoing otolaryngological surgery with cuffed endotracheal tube