Excessive dynamic airway collapse (EDAC) refers to a dynamic form of central airway obstruction characterized by a decrease of ≥50% (more recent publications suggest >70%) in the cross-sectional area of the tracheobronchial lumen. Diagnosis is usually confirmed by dynamic cross sectional imaging studies or bronchoscopy.
Some authors consider an overlap with tracheomalacia, however it is best thought that tracheomalacia describes a pathology whereby the cartilaginous structures of the trachea are weak, while EDAC is a mechanical description of resultant effect on the airway 1.
It is marked by excessive bulging of the posterior membrane into the airway lumen during exhalation.
Can co-exist patient with chronic obstructive pulmonary disease 1
Some classification on terms severity with some proposing a collapse of >90% during expiration on dynamic imaging being considered as severe 4.
Typically exaggerated bulging of the posterior wall within the airway lumen during exhalation with an an excessive flattening in AP diameter.
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- 2. Murgu SD, Colt HG. Treatment of adult tracheobronchomalacia and excessive dynamic airway collapse : an update. (2006) Treatments in respiratory medicine. 5 (2): 103-15. Pubmed
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