Evaluation of the upper airway in sleep apnea syndrome.

The upper airway is the final common site for abnormalities in respiratory control and neuromuscular function leading to sleep apnea. This review summarizes the information that pharyngeal assessment provides for understanding upper airway pathophysiology and selecting treatment. The applications and limitations of both static and dynamic techniques are examined in awake and sleeping patients. The effects of posture on the upper airway and the usefulness for predicting treatment efficiency are examined.