Choanal atresia presenting as bilateral obstruction is a neonatal emergency. It presents as cyclic cyanosis — the newborn turns blue when crying. The explanation for this pattern is:

• A Crying increases abdominal pressure, compressing the diaphragm and reducing lung ventilation
• B Neonates are obligate nasal breathers; crying (mouth breathing) relieves the obstruction, while closing the mouth to rest results in cyanosis ✓
• C Cry stimulates parasympathetic secretion, blocking the choanal passage further with mucus
• D Crying increases intracranial pressure, reducing cerebral oxygenation directly

Explanation

Neonates are obligate nasal breathers (cannot mouth breathe effectively) because the larynx sits high, directly engaging with the nasopharynx. In bilateral choanal atresia, air cannot pass through the nose to the nasopharynx. At rest/feeding (mouth closed), the baby is cyanosed. When the baby cries (mouth opens), oropharyngeal breathing is possible and oxygenation improves — hence cyclic (paradoxical) cyanosis: blue at rest, pink when crying. This is the classic sign. Immediate management is oral airway (McGovern nipple) and urgent surgical correction.

Reference: Dhingra Diseases of Ear, Nose and Throat, 7th ed.

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Written and medically reviewed by the StethoPrep medical team.