Evidence-Based Practice
نویسندگان
چکیده
Nasal obstruction is a complaint frequently encountered in otolaryngology. This obstruction can occur as a result of underlying inflammatory or anatomic pathologic conditions. Inflammatory pathologic conditions include allergic rhinitis, nasal polyposis, and chronic rhinosinusitis. Among the anatomic causes are septal deviation, turbinate hypertrophy, and nasal valve compromise (NVC). The nasal valve was first described by Mink in the early twentieth century but has received increasing attention recently. It is the narrowest portion of the nasal airway and, therefore, where the most resistance to airflow occurs. It can be divided into external and internal portions (Fig. 1). The external nasal valve is the area in the nasal vestibule formed by the alar rim, nasal sill, caudal septum, and medial crus of the lower lateral cartilage. The
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