We have devised a simple method to continuously measure the endotracheal tube cuff pressure (CP) using an invasive pressure monitoring setup (IPMS), which is used routinely in the operating room to monitor arterial or central venous pressures. We have previously confirmed both in vitro and in vivo (previous IRB approved protocol), a clinically applicable agreement of the IPMS readings with the values obtained from a standard manometer (gold standard). In the current study, we will prospectively evaluate the relationship between the patient's head position and CP in patients undergoing otolaryngological surgery. A secondary outcome measure is the oxygen or nitrous oxygen concentration in the oropharynx.

Inclusion Criteria:

• Less than 18 years of age, 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.

Less than 18 years of age, undergoing otolaryngological surgery with endotracheal intubation.