What is the best next step in management for a 22‑year‑old woman with exercise‑induced bronchoconstriction demonstrated by a 15% fall in forced expiratory volume in one second after treadmill testing and normal baseline spirometry?

Management of Exercise-Induced Bronchoconstriction in a Young Athlete

Start fluticasone daily (option a) is the best next step for this patient who exercises 2 hours daily and requires frequent albuterol use. 1

Rationale for Daily Inhaled Corticosteroid

This 22-year-old athlete has confirmed exercise-induced bronchoconstriction (EIB) with a 15% fall in FEV1 during provocation testing and normal baseline spirometry (FEV1/FVC 87%). The critical decision point is that she exercises daily for approximately 2 hours, which means she would require daily or near-daily SABA use for adequate symptom control. 1

Why Daily Controller Therapy is Indicated

• A controller agent should be added whenever SABA therapy is used daily or more frequently. 1 This patient practices sports daily with 2-hour sessions, making daily SABA use inevitable.

• Daily or regular use of beta-agonists (either short-acting or long-acting) leads to tolerance and tachyphylaxis, manifested as reduced duration of bronchoprotection and prolonged recovery time after exercise. 1 This occurs due to desensitization of beta-2 receptors on mast cells and airway smooth muscle. 1

• Inhaled corticosteroids used for 4 weeks or more significantly attenuate EIB with a weighted mean difference of approximately 14% in the percent fall of FEV1. 2

Why NOT the Other Options

Option b (salmeterol daily): Daily LABA monotherapy is strongly contraindicated in patients with normal or near-normal baseline lung function (FEV1 >80% predicted). 1 This patient's baseline FEV1 is 4.5L with FEV1/FVC of 87%, indicating excellent baseline function. The guidelines explicitly state that combination therapy with LABA should not be used in persons with FEV1 >80% of predicted due to serious safety concerns including increased morbidity and mortality. 1

Option c (albuterol multiple times daily): While SABA before exercise is the first-line acute intervention, using it multiple times daily without a controller medication is inappropriate. 1 This approach leads to tolerance, and the guidelines specifically recommend adding a controller when SABA is needed daily or more frequently. 1

Option d (budesonide/formoterol prior to exercise): This combination therapy is contraindicated in patients with normal baseline lung function due to the LABA component. 1 Additionally, ICS should not be administered only before exercise—they require daily use for 2-4 weeks to achieve maximal benefit. 1

Implementation Strategy

• Start fluticasone (or another ICS) as daily maintenance therapy. 1

• Continue albuterol as needed before exercise for additional bronchoprotection, typically 15 minutes prior to activity. 1 The ICS does not eliminate the need for acute SABA therapy but reduces the frequency and severity of EIB. 1

• Expect 2-4 weeks for maximal therapeutic effect from the inhaled corticosteroid. 1

• Alternative controller options if ICS is not tolerated include daily leukotriene receptor antagonists (strong recommendation) or mast cell stabilizers before exercise where available. 1

Common Pitfalls to Avoid

• Do not use ICS only before exercise—this is ineffective as anti-inflammatory effects require consistent daily dosing. 1

• Avoid LABA monotherapy in patients with normal baseline spirometry due to safety concerns. 1

• Do not rely on multiple daily SABA doses without controller therapy—this leads to tolerance and inadequate long-term control. 1

• Recognize that EIB can occur without underlying asthma, but the treatment approach remains similar when symptoms require daily intervention. 1