Acute Bronchoconstriction Triggers

Introduction to Triggers

Exposure to allergens, cold air, and particulate matter can trigger acute bronchoconstriction in affected individuals, according to the American Thoracic Society 1, 2, 3

IgE-mediated inhalant allergen exposures induce airway inflammation with eosinophils and airway hyperresponsiveness, triggering bronchoconstriction through mast cell degranulation and release of inflammatory mediators including histamine, tryptase, and leukotrienes, as stated by the American Academy of Allergy, Asthma, and Immunology 3, 4

Cold air exposure triggers bronchoconstriction through both direct airway effects and cutaneous reflex mechanisms, as reported by the American College of Allergy, Asthma, and Immunology 2, 5, 4
At high ventilation levels, the direct airway effects of cold air contribute additional bronchoconstriction by creating a hyperosmolar environment through water loss from the airway surface, according to the American Thoracic Society 2, 5, 4

Particulate matter and air pollutants are recognized exacerbants of asthma that trigger acute bronchoconstriction, as stated by the American Lung Association 1
Workplace exposures to dusts, fumes, and sprays trigger bronchoconstriction in workers with hyperreactive airways, accounting for 15-25% of asthma in adults, according to the Occupational Safety and Health Administration 1, 3

All three triggers share a common pathway involving mast cell degranulation and release of inflammatory mediators that act on airway smooth muscle to cause bronchoconstriction, as reported by the American Academy of Allergy, Asthma, and Immunology 2, 5, 3, 4

Patients with poorly controlled underlying asthma or severe airway hyperresponsiveness are at greatest risk for bronchoconstriction from these triggers, according to the National Asthma Education and Prevention Program 1
Protective measures include avoiding known triggers, using face masks or scarves in cold weather to warm and humidify air, and appropriate pharmacologic prophylaxis with short-acting β2-agonists 15 minutes before anticipated exposure, as recommended by the American College of Allergy, Asthma, and Immunology 6, 4