In a 12-year-old child with dry cough, expiratory wheezing, and nasal congestion but no prior history of asthma, what is the appropriate evaluation and management?

Initial Management: Investigate for Upper Airway Disease, Not Asthma

This 12-year-old should NOT be diagnosed with asthma based on symptoms alone, and the dry cough without wheeze suggests upper airway pathology rather than asthma 1. The presence of nasal congestion strongly points toward rhinitis or upper airway disease as the primary driver of symptoms.

Diagnostic Approach

Why This Is Unlikely to Be Asthma

The European Respiratory Society guidelines explicitly state that children with chronic cough as the only symptom are unlikely to have asthma and should be investigated according to chronic cough protocols 1. While this patient has expiratory wheezing on examination, the predominant symptom is dry cough with nasal congestion, which creates a different clinical picture.

Recent population-based research confirms that children with dry cough without wheeze have fundamentally different characteristics from those with wheeze 2:

• They have normal FeNO and spirometry (unlike wheezers who show bronchial obstruction)
• They more frequently report rhinitis and frequent colds
• They lack the atopic features (hay fever, eczema, parental asthma) typical of asthma
• Asthma is unlikely in this phenotype

Required Objective Testing

Do not diagnose asthma based on symptoms alone 1. The guideline provides a strong recommendation against this practice. You must obtain:

1. Spirometry - Strong recommendation as part of diagnostic workup 1

   • Look for FEV1/FVC <80% or <LLN
   • Look for FEV1 <80% predicted or <LLN
   • Normal spirometry does NOT exclude asthma but makes it less likely

2. Bronchodilator Response (BDR) testing - If spirometry shows obstruction 1

   • Administer 400 μg SABA
   • Positive: ≥12% AND/OR ≥200 mL increase in FEV1
   • Negative BDR does not exclude asthma

3. Consider FeNO measurement - Children with isolated cough have normal FeNO unlike true asthmatics 2

Most Likely Diagnoses to Investigate

Primary Consideration: Upper Airway Disease

Given the nasal congestion and dry cough combination:

• Allergic rhinitis with post-nasal drip
• Chronic rhinosinusitis
• Upper airway cough syndrome

The nasal congestion is a critical clue that upper airway inflammation is driving the cough and potentially causing the wheeze through post-nasal drip or upper airway irritation.

Alternative Diagnoses to Exclude

If symptoms persist >4 weeks, consider 1:

• Gastroesophageal reflux disease (common cause in younger children) 3
• Foreign body aspiration (always consider in acute presentations) 4, 3
• Protracted bacterial bronchitis
• Pertussis or post-viral cough

Initial Management Strategy

Step 1: Treat Upper Airway Disease First

• Intranasal corticosteroids for nasal congestion/rhinitis
• Oral antihistamines if allergic component suspected
• Nasal saline irrigation
• Environmental control - eliminate tobacco smoke exposure, reduce allergen exposure 4

Step 2: Reassess in 2-4 Weeks

Monitor for:

• Resolution of cough and wheeze with upper airway treatment
• Persistence of symptoms despite adequate treatment
• Development of new symptoms

Step 3: If Symptoms Persist Despite Upper Airway Treatment

Only then consider:

• Chest radiography - recommended for recurrent wheezing without clear etiology 3
• Referral for further investigation per chronic cough guidelines 1
• Trial of ICS therapy - but ONLY if spirometry is abnormal with negative BDR 1

Critical Pitfalls to Avoid

Do NOT empirically start asthma medications without objective testing 1. The guidelines explicitly recommend against using symptom improvement after preventer medication trials to diagnose asthma.

Do NOT use the term "cough variant asthma" in children 4, 5. This diagnosis requires:

• Older children with physiologic evidence of variable airflow obstruction
• Clear bronchodilator response
• In younger children: abnormally increased cough, no alternative diagnosis, clear response to moderate-dose ICS, and relapse/response pattern 5

Do NOT prescribe over-the-counter cough medications - they are ineffective for symptomatic relief 4.

When to Suspect True Asthma

Reconsider asthma if the patient has 1, 2:

• Recurrent wheeze (not just this single episode)
• Personal history of atopy (eczema, food allergies)
• Family history of asthma in parents
• Hay fever
• Abnormal spirometry with positive BDR
• Elevated FeNO

The absence of these features, combined with prominent nasal symptoms and isolated dry cough, makes asthma significantly less likely in this presentation.