Nasal Resonance distortion results from a disturbance in resonance which is not related to laryngeal function. In hypernasality or severe nasality there is faulty control in palato-pharyngeal valving ...
Nitric oxide (NO) in the upper airway arises chiefly from paranasal sinus epithelium and is released into the nasal cavity where it can be quantified non-invasively as nasal nitric oxide (nNO).