Laryngotracheomalacia is a common pediatric condition characterized by the inherent weakness of the airway walls, which leads to reduced airway lumen dynamics. This structural instability causes the airway to collapse during respiratory effort, often presenting with symptoms such as inspiratory stridor, recurrent cough, or bronchitis. While many cases are self-limiting and resolve before a child reaches 2 years of age, the condition requires careful clinical differentiation from other respiratory issues, most notably asthma.
Pathophysiology and Etiology
The exact pathogenesis of laryngotracheomalacia is not fully understood, but current research points toward a multifactorial origin. It is suggested that genetic alterations affecting cartilage development may combine with central nervous system (CNS) immaturity, which results in abnormal peripheral nerve integration.
The physiological hallmark of the condition is the collapse of the airway during breathing. The specific manifestation of symptoms depends heavily on the anatomical location of the weakness:
- Laryngomalacia (Extrathoracic obstruction): Weakness in the larynx typically causes inspiratory stridor, which may be exacerbated by crying or coughing.
- Tracheomalacia (Intrathoracic obstruction): Weakness in the trachea or main bronchi often leads to expiratory stridor. Furthermore, increased intrathoracic pressure can cause the trachea and main bronchi to collapse, frequently manifesting as a recurrent cough.
- Vocal Cord Lesions: These can result in a combination of both inspiratory and expiratory stridor.
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