Laryngospasm

Sudden convulsive closure of the voice box.

A muscular spasm which suddenly closes the larynx.

Closure of the larynx that blocks the passage of air to the lungs; usually associated with severe allergic reaction or severe laryngeal inflammation, especially in young children.

A strong, rapid, involuntary contraction of the muscles in the larynx (voice box). In addition to producing speech, the larynx serves as a protective “gateway” between the upper airway (the mouth, nose, and throat) and the sterile lower airway (the trachea and lungs). As such, it prevents foreign material from entering the trachea and lungs. When an abnormal stimulus reaches the larynx, the muscles contract to prevent material from being inhaled into the lungs. In adults, gastroesophageal reflux disease (GERD; see esophageal reflux), a condition in which acidic contents of the stomach rise into the esophagus, can be the cause of laryngospasm. In children, it may be caused by epiglottitis (inflammation of the flap of elastic cartilage overhanging the entrance to the larynx). The changes in chest pressure produced by laryngospasm can compromise the heart and lungs. A person experiencing laryngospasm should try to remain calm because anxiety can exacerbate the spasm. If the person loses consciousness, which almost never happens, emergency medical treatment is required. Usually the muscles relax before the person loses consciousness, and the condition is relieved.

Closure of the larynx, obstructing the flow of air to the lungs. It usually occurs as part of an allergic reaction, such as angioneurotic edema.