Which position is likely to worsen stridor in infants with laryngomalacia?

The position that is likely to worsen stridor in infants with laryngomalacia is supine. In infants with laryngomalacia, the soft tissue above the larynx is prone to collapse during breathing, which can lead to stridor—a high-pitched wheezing sound caused by turbulent airflow through narrowed pathways in the larynx.

When an infant is placed in a supine position, the gravitational forces can exacerbate the collapse of the laryngeal structures. This positional aggravation of the airway can result in increased airway obstruction and worsen stridor. In contrast, being in a prone position can help by encouraging better airway patency due to gravity's effect on the airway structures, while sitting upright or standing usually promotes a more open airway and can alleviate respiratory distress.

Understanding the mechanics of airway dynamics in laryngomalacia is crucial, as the positioning of the infant plays a significant role in their respiratory status.