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 the 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 excessive flattening in AP diameter.
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