Diagnosing Exercise-Induced Laryngeal Dysfunction

Clinical Presentation

The American Academy of Allergy, Asthma, and Immunology suggests that episodic shortness of breath and chest tightness during exercise are key findings that point toward exercise-induced laryngeal dysfunction rather than exercise-induced bronchoconstriction (EIB) 1
Patients with exercise-induced laryngeal dysfunction often have a poor response to asthma prevention medications, as noted by the American College of Allergy, Asthma, and Immunology 1
Normal expiratory findings on pulmonary function tests, including normal FEV1 and FVC values, are characteristic of exercise-induced laryngeal dysfunction, according to the American Thoracic Society 2
A flattened inspiratory flow loop is a hallmark sign of exercise-induced laryngeal dysfunction, as indicated by the European Respiratory Society 1, 2

The American Academy of Allergy, Asthma, and Immunology recommends recognizing the pattern of a flattened inspiratory flow loop with normal expiratory parameters, which strongly suggests upper airway/laryngeal dysfunction rather than asthma 1, 3
The American College of Chest Physicians suggests that flexible laryngoscopy during exercise is the gold standard for diagnosing exercise-induced laryngeal dysfunction, allowing direct observation of vocal cord adduction or other laryngeal abnormalities 1, 2
Continuous laryngoscopy during exercise challenge provides a definitive diagnosis of exercise-induced laryngeal dysfunction, as noted by the American Thoracic Society 1

The American Academy of Otolaryngology suggests that paradoxical vocal cord dysfunction (VCD) is a type of exercise-induced laryngeal dysfunction that can coexist with exercise-induced bronchoconstriction (EIB) 1, 2
The American College of Sports Medicine indicates that exercise-induced laryngeal dysfunction is more common in adolescent athletes and requires different management approaches than asthma 4, 2
The American Academy of Allergy, Asthma, and Immunology notes that failure to respond to standard asthma management is a key historical feature suggesting exercise-induced laryngeal dysfunction 1
The European Respiratory Society suggests that the timing of symptoms (during vs. after exercise) helps differentiate exercise-induced laryngeal dysfunction from exercise-induced bronchoconstriction (EIB) 4

The American Thoracic Society indicates that exercise-induced laryngeal dysfunction will not respond to traditional asthma medications like β2-agonists 4
The American College of Allergy, Asthma, and Immunology notes that untreated exercise-induced laryngeal dysfunction can significantly impact athletic performance and quality of life 1
The American Academy of Otolaryngology suggests that appropriate treatment approaches for exercise-induced laryngeal dysfunction differ substantially from asthma management 1, 2

The American Academy of Allergy, Asthma, and Immunology recommends performing continuous laryngoscopy during exercise challenge as the gold standard diagnostic test for exercise-induced laryngeal dysfunction (EILD) 5, 6, 7
Symptoms of EILD, such as inspiratory stridor and throat tightness, occur and peak during exercise, rather than 5-20 minutes after stopping, which is the hallmark timing for exercise-induced bronchoconstriction (EIB) 5, 6, 7
The presence of a family history of weak voice suggests an inherited structural laryngeal abnormality, possibly laryngomalacia, which can be congenital but may not manifest until competitive sports participation 8, 6

Inspiratory stridor with throat tightness during maximal exercise that resolves within approximately 5 minutes of stopping is a key diagnostic feature of EILD 5, 6, 7
Rapid symptom resolution after exercise cessation, unlike asthma which peaks 5-20 minutes post-exercise, is another diagnostic feature of EILD 5, 6
Flattening or truncation of the inspiratory portion of the flow-volume loop during symptomatic periods indicates variable extrathoracic airway obstruction, the signature finding of EILD 5, 6

The American Academy of Allergy, Asthma, and Immunology recommends speech therapy as the cornerstone of treatment for EILD 5, 6, 7
If laryngomalacia is confirmed, supraglottoplasty may be indicated, as surgical intervention improves late-onset laryngomalacia 8, 6
Treating concurrent gastroesophageal reflux disease (GERD) empirically is also recommended, as posterior laryngeal changes from GERD are common in juveniles with vocal cord dysfunction (VCD) 8, 6

EILD is frequently misdiagnosed as asthma, leading to inappropriate corticosteroid overtreatment with consequent morbidity 5, 8, 6
EILD can coexist with true exercise-induced bronchoconstriction (EIB), and up to 20-40% of VCD patients also have asthma 5, 8, 6
Laryngoscopy and spirometry must be performed during symptomatic periods, as these findings are intermittent and will be normal between episodes 5, 6, 7