Phenotypes of Obstructive Sleep Apnea.

Obstructive sleep apnea (OSA) is a multisystem breathing disorder associated with increased morbidity and mortality. Clinical and operative assessment tools improve surgical approaches to treat airway obstruction. The primary sites of anatomic obstruction are at the levels of the nasal, palatal, and hypopharyngeal airway. The literature suggests a relationship between reduced neuromuscular tone and the age-related increase in OSA prevalence for normal-weight adults. Pharyngeal soft tissue collapse due to reduced airway pressure is defined as the critical closing pressure. Respiratory biochemistry homeostasis is an additional factor in maintaining airway patency.