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Vocal cord dysfunction may be caused by work
Date:9/6/2007

Researchers from the UAB and the Vall d'Hebron Hospital have diagnosed two patients affected with vocal cord dysfunction, which causes coughing and difficulty in breathing due to irritating agents that are breathed in at the workplace. Until now, medical literature had only described two cases of patients with occupational vocal dysfunction.

Vocal cord dysfunction is an illness produced by a closure in the vocal cords when inhaling. Under normal conditions, the vocal cords would be open. It is a relatively frequent illness that is often mistaken for bronchial asthma given patients' symptoms, such as coughing, sensation of choking, wheezing, hoarseness and difficulties in breathing. Sometimes the conditions are so severe that patients must be intubated or even admitted to an intensive care unit. The diagnosis of this dysfunction is based on observing the flattening of the inspiratory limb in the flow-volume curve and observing the closure of the vocal cords with a laryngoscope.

People who suffer from this illness often also have different psychiatric problems, especially anxiety and/or depression. When they find themselves in stressful situations, their arytenoid cartilage moves in an abnormal way, leading to a paradoxical closure of the vocal cords.

In the past 15 years, apart from appearing within the context of psychiatric illnesses, cases have also been found among patients who found that their vocal cords often did not function correctly after having inhaled irritating agents at work. More specifically, the cases described began after workers were accidentally exposed to a high dose of an irritating agent. The same symptoms appeared each time they were exposed to other irritating agents at doses that normally do not have these effects on people.

Research on two new patients diagnosed with vocal cord dysfunction was carried out by a research group directed by Xavier Nuoz, professor of Medicine at the UAB and doctor at the
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Contact: Mara Jes s Delgado
mariajesus.delgado@uab.es
34-935-814-049
Universitat Autonoma de Barcelona
Source:Eurekalert

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