A newborn is found to have stridor. What is the the commonest cause of stridor in a newborn?
Laryngomalacia
Foreign body
Meconium aspiration
Recurrent laryngeal nerve palsy due to bih
Laryngomalacia is the most common cause of stridor in infants, and is also the most common congenital laryngeal abnormality, accounting for approximately 60% of cases. Stridor occurs as a result of prolapse of the supraglottic structures into the laryngeal inlet on inspiration. Also know: Stridor is generally of laryngeal or tracheal origin. As a general rule, inspiratory stridor originates from the supraglottis and glottis, expiratory stridor from the trachea, and biphasic stridor from the subglottis. Ref: Yates P.D. (2012). Chapter 33. Stridor in Children. In A.K. Lalwani (Ed), CURRENT Diagnosis & Treatment in Otolaryngology--Head & Neck Surgery, 3e.