Which of the following is a common result of subglottic injury?

Impaired ciliary action is indeed a common result of subglottic injury. The subglottic area of the airway includes the region just below the vocal cords, which is a critical zone for airway protection and function. Cilia are small, hair-like structures that line the respiratory tract and play a key role in clearing mucus and debris from the airway. When there is an injury to the subglottic region, it can lead to inflammation and damage to the epithelial lining, which disrupts ciliary function.

This impaired ciliary action can cause a decrease in mucociliary clearance, making the airway more susceptible to infection and obstruction. Such a condition can severely impact respiratory health, particularly in individuals who have sustained burns or other injuries in this area.

The other options, while pertaining to possible complications associated with laryngeal injuries, do not specifically describe the direct result of subglottic injury as effectively as impaired ciliary action does. Compressive fractures of the larynx, increased airway resistance, and collapse of the trachea are more specific to different types of trauma or injury rather than a common outcome of damage occurring specifically in the subglottic region.