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'Chief Complaint: Nasal Congestion'.
Journal of Allergy and Clinical Immunology in Practice 2024 April 26
Nasal obstruction is the subjective perception and objective state of insufficient airflow through the nose. Nasal congestion, on the other hand, describes a state of not just inadequate airflow or obstructive phenomena but also pressure and mucus related states to the patient. Nasal receptors belonging to the transient receptor potential (TRP) protein family mediate the sense of nasal patency via the trigeminal nerve. TRPM8 responds to temperatures around 8-22 °C, and is stimulated by menthol and other cooling agents. The radiant effects of airflow create heat loss to activate these receptors and humans perceive this as nasal patency rather than the direct detection of airflow. The thermovascular state of the mucosa, in conditions such as rhinitis, influence TRPM8 activation. Nasal endoscopy can show signs of rhinitis and should be considered an essential part of the workup of nasal congestion. Efforts to relieve nasal congestion need to manage the mucosal state and surgery needs to ensures that the nasal cavity mucosa is exposed to the cooling effects of airflow rather than simply creating a passage to the nasopharynx.
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