ICD-11 definition : Breathing through mouth. Nasal obstruction may also necessitate mouth breathing, which
itself can precipitate obstructive apnea. Breathing through the mouth may also increase
risk for OSA by its effect on the tongue. The tongue forms the anterior wall of the
oropharynx; both the supine posture and opening of the mouth tend to displace it posteriorly
and encourage airway closure.;
Breathing through mouth. Nasal obstruction may also necessitate mouth breathing, which
itself can precipitate obstructive apnea. Breathing through the mouth may also increase
risk for OSA by its effect on the tongue. The tongue forms the anterior wall of the
oropharynx; both the supine posture and opening of the mouth tend to displace it posteriorly
and encourage airway closure.