[Clinical Management of Choanal Atresia]

Choanal atresia (CA) is a rare congenital anomaly of the nasal airway with an incidence of 1/5000 to 1/9000, which may occur unilateral (uCA) or bilateral (bCA). bCA manifests as an acute emergency immediately after birth by airway obstruction and paradoxical cyanosis, whereas uCA may present with a heterogeneous clinical picture in addition to unilateral nasal airway obstruction. Fiber endoscopic examination and cranial computed tomography are the gold standard in the diagnosis of CA. CA often occurs in association with congenital malformation syndromes, among which CHARGE syndrome stands out. Due to cardiopulmonary instability and difficult intubation conditions, syndromic CA patients should be considered as a separate risk group. After securing the airway, bCA must be treated surgically without delay, whereas correction of uCA should not be performed until after six months of age. Endoscopic techniques are the surgical standard in the treatment of CA. Different approaches can be distinguished: transnasal puncture of the atresia plate with subsequent extension medially and laterally, creation of a septal window with subsequent resection of the posterior vomer and atresia plate, and elevation of mucoperiosteal flaps with subsequent opening of the atresia plate. The transpalatal approach should only be employed in anatomically complex cases. The use of conventional choanal stents in the primary treatment of CA is increasingly rejected and should be reserved for high-risk constellations. Similarly, local application of mitomycin C should be avoided.