Abstract:
INTRODUCTION:Intermittent paradoxical closure of the vocal cords can induce major attacks of dyspnea. Such attacks, called "vocal cord dysfunction" (VCD), are an important element in the differential diagnosis of intractable bronchial asthma. METHODS:Selective review of the literature. RESULTS:The etiology of VCD is unclear. Its clinical manifestations can mimic those of bronchial asthma. Standard asthma medication fails to improve the dyspnea of VCD, which is subjectively perceived as life-threatening. Consequently, patients with unrecognized VCD may be treated with very high doses of anti-asthmatic medication, including systemic corticosteroids, leading to major iatrogenic morbidity. No prospective studies are available on this subject to date. Experts estimate that 3% to 5% of persons diagnosed as having bronchial asthma actually suffer from VCD. Because of the brevity of the attacks, which usually last only 1-2 minutes, VCD is difficult to diagnose with the methods generally used to diagnose asthma. Evidence-based therapeutic approaches are still lacking, but speech therapy, including special breathing techniques with relaxation of the throat, seems to control the attacks of dyspnea in most patients. DISCUSSION:An improved knowledge of the clinical manifestations of VCD can help physicians diagnose it correctly. Early diagnosis can prevent prolonged erroneous treatment based on a false diagnosis of bronchial asthma and thereby obviate the iatrogenic side effects of long-term corticosteroid therapy, as well as the resulting economic losses.
journal_name
Dtsch Arztebl Intjournal_title
Deutsches Arzteblatt internationalauthors
Kenn K,Hess MMdoi
10.3238/arztebl.2008.0699subject
Has Abstractpub_date
2008-10-01 00:00:00pages
699-704issue
41issn
1866-0452journal_volume
105pub_type
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journal_title:Deutsches Arzteblatt international
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