What mechanism does laryngospasm involve?

Laryngospasm involves the involuntary closure of the vocal cords, which serves as a protective reflex to prevent foreign materials from entering the airway. This reflex is particularly critical during situations like aspiration or when a surgical procedure is being performed in the vicinity of the airway. By closing, the vocal cords help to safeguard the lower respiratory tract from potential irritants or obstruction, thereby maintaining airway integrity and preventing aspiration pneumonia or other complications.

The other mechanisms mentioned, such as the expansion of the trachea, contraction of the diaphragm, or inflation of the lungs, do not accurately describe the process of laryngospasm. Instead, they relate to general respiratory mechanics rather than the specific protective action of the vocal cords during laryngospasm. Understanding this protective mechanism is essential in oral and maxillofacial surgery, as it highlights the importance of airway management and the potential risks that might arise during procedures involving the throat and larynx.