How should I manage a 21-year-old woman with a two-week viral upper respiratory infection now resolved except for sore throat worsened by cold foods, mild exercise-induced shortness of breath, and diffuse tight lung sounds with stable vital signs?

Management of Post-Viral Exercise-Induced Bronchospasm

This patient most likely has exercise-induced bronchoconstriction (EIB) following her viral URI, and you should prescribe an inhaled short-acting beta-2 agonist (SABA) to use 5-20 minutes before exercise, which will provide protection for 2-4 hours. 1, 2, 1

Clinical Reasoning

This 21-year-old woman presents with a classic post-viral pattern: resolved URI symptoms except for cold-triggered throat pain and new-onset exercise-induced dyspnea with "tight" lung sounds. The combination of exercise-induced shortness of breath and diffuse tight lung sounds (suggesting bronchospasm) following a viral respiratory infection strongly suggests post-viral EIB, even without frank wheezing.

Key Diagnostic Considerations

The 2016 EIB guidelines emphasize that self-reported symptoms alone are not diagnostic 1. However, given stable vital signs and the clinical context, you can proceed with empiric treatment while considering objective testing if symptoms persist.

If symptoms don't improve with SABA therapy within 1-2 weeks, perform spirometry and consider bronchoprovocation testing (exercise challenge or methacholine challenge) to confirm EIB 1. The guidelines specify that patients should achieve ≥85% maximum heart rate for 6 minutes during exercise challenge, with a ≥15% drop in FEV1 post-exercise confirming the diagnosis 2, 3.

Differential Diagnosis to Exclude

Before committing to EIB treatment, briefly assess for:

• Exercise-induced laryngeal dysfunction: Listen for inspiratory stridor (she has expiratory tightness, making this less likely) 1
• Cardiac causes: Her age and stable vitals make this unlikely, but ask about chest pain or palpitations 1
• Underlying asthma: Does she have nocturnal symptoms, daytime wheeze, or family history? 2

The cold-food throat pain is likely residual pharyngeal inflammation from the URI and should resolve spontaneously—this is not related to her respiratory symptoms.

Treatment Algorithm

First-Line Therapy

Prescribe albuterol (or equivalent SABA) 2 puffs via MDI with spacer, 5-20 minutes before exercise 1, 2, 1. This provides 2-4 hours of protection and works in >80% of patients with EIB 2.

Important Prescribing Caveats

• Use intermittently (<4 times per week) to avoid tachyphylaxis 1
• If she needs daily SABA or uses it ≥4 times weekly, this suggests poorly controlled underlying asthma requiring daily controller therapy 2, 1
• Daily use of beta-agonists leads to tolerance, reducing both duration and magnitude of protection 1

If SABA Alone Is Insufficient

If symptoms persist despite appropriate SABA use after 1-2 weeks:

1. Add a leukotriene receptor antagonist (montelukast) as daily therapy 1, 2, 1

   • Attenuates EIB in ~50% of patients
   • Does NOT cause tolerance with daily use
   • Can be used intermittently (hours before exercise) or as maintenance
   • Provides incomplete protection but is effective adjunctive therapy

2. Consider mast cell stabilizers (cromolyn sodium, if available) 1, 2

   • Take shortly before exercise
   • Less effective than SABAs but can be added for synergistic effect
   • Short duration of action

3. If frequent symptoms suggest underlying asthma, initiate inhaled corticosteroids 2, 4, 5

   • Low-dose ICS is the preferred long-term controller
   • May take up to 8 weeks for complete cough resolution 5
   • Reassess in 2-4 weeks

Non-Pharmacologic Strategies

Counsel her on:

• Warm-up exercises: 10-15 minutes of variable high-intensity interval exercise before main activity reduces EIB for up to 2 hours (the "refractory period") 2, 6
• Avoid cold, dry air: Use a scarf or mask over mouth during outdoor winter exercise 2
• Gradual return to exercise: Post-viral airway hyperresponsiveness typically resolves within weeks to months 5

Follow-Up Plan

• Reassess in 2 weeks: If SABA provides adequate relief and she's using it <4 times weekly, continue as needed
• If no improvement or worsening: Perform spirometry ± bronchoprovocation testing to confirm diagnosis 1
• If requiring daily SABA: This indicates need for daily controller therapy (ICS ± leukotriene modifier) and suggests underlying asthma rather than isolated EIB 2, 1

Common Pitfalls to Avoid

1. Don't prescribe antibiotics: Her URI has resolved, and the remaining symptoms are bronchospasm-related, not infectious 7
2. Don't ignore persistent symptoms: Post-viral EIB lasting >4-6 weeks may indicate unmasking of underlying asthma requiring controller therapy 2, 5
3. Don't use antihistamines: Unless she has documented allergies, antihistamines are ineffective for EIB 6
4. Don't prescribe daily LABA without ICS: This can mask poorly controlled asthma and leads to tolerance 1