In a 34-year-old woman with a persistent, nonproductive nocturnal cough that awakens her several times a month, normal physical exam, chest radiograph, sinus CT, and laryngoscopy, and no improvement with nasal fluticasone or omeprazole, which is the most likely diagnosis: gastroesophageal reflux disease (GERD) associated cough, cough‑variant asthma, or upper airway cough syndrome?

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Cough-Variant Asthma

The most likely diagnosis in this patient is cough-variant asthma. This 34-year-old woman with nocturnal nonproductive cough, history of allergic reactions (atopy), normal chest radiograph and sinus imaging, and failure to respond to treatment for upper airway cough syndrome (UACS) and GERD fits the classic presentation for cough-variant asthma.

Diagnostic Reasoning

The ACCP evidence-based guidelines 1 provide a clear algorithmic approach to chronic cough evaluation. According to this framework:

Why UACS is Ruled Out

  • Failed empiric therapy: She used fluticasone nasal spray for 2 months without improvement 1
  • No supporting symptoms: Absence of sinus symptoms, postnasal drip, or nasal congestion
  • Normal imaging: Sinus CT is normal, ruling out "silent sinusitis" 2
  • Normal laryngoscopy: ENT evaluation showed no upper airway pathology

Why GERD is Less Likely

While GERD remains a consideration, several factors make it less probable as the primary diagnosis:

  • Failed PPI trial: A 2-month trial of omeprazole was unsuccessful 1
  • No reflux symptoms: She denies heartburn, sour taste, or regurgitation 2
  • Variable response time: GERD-related cough typically requires 2-3 months of intensive therapy to respond, and some patients need prokinetic agents added 1, 2, 1
  • Clinical profile mismatch: While she meets some criteria from the GERD predictive profile (chronic cough >2 months, normal chest X-ray, nonsmoker, not on ACE inhibitors), the guideline specifically states GERD should be evaluated after UACS and asthma have been ruled out 1

Why Cough-Variant Asthma is Most Likely

Key supporting features:

  • Atopic history: Multiple allergic reactions (eggs, walnuts, strawberries) strongly suggest an atopic phenotype, which predisposes to asthma 3
  • Nocturnal pattern: Cough predominantly at night is characteristic of asthma 2
  • Normal spirometry doesn't exclude it: Cough-variant asthma often presents with normal baseline spirometry 3
  • Algorithmic sequence: According to ACCP guidelines, asthma should be evaluated after UACS but before GERD 1

Recommended Next Steps

Diagnostic Confirmation

  1. Bronchoprovocation challenge (methacholine): This is the gold standard when baseline spirometry is normal 1, 3
  2. Fractional exhaled nitric oxide (FeNO): Elevated levels support eosinophilic airway inflammation 3, 4
  3. Induced sputum analysis: If available, can identify eosinophilic bronchitis (though this would show normal bronchial hyperresponsiveness) 1

Empiric Treatment Trial

If bronchoprovocation testing is unavailable, the guidelines support empiric treatment 1:

Initial therapy:

  • Inhaled corticosteroids (ICS) - primary treatment
  • Inhaled β-agonists as needed
  • Consider adding leukotriene receptor antagonist 1

If no response to inhaled therapy:

  • Oral corticosteroids (prednisone 40 mg/day for 5-10 days) provide definitive diagnostic and therapeutic confirmation 1
  • The vast majority of patients with asthmatic cough respond to this regimen and can then be switched to inhalational therapy 1

Important Clinical Pitfalls

Common diagnostic errors to avoid:

  • Assuming normal spirometry rules out asthma - it doesn't in cough-variant asthma 3
  • Prematurely diagnosing GERD without adequately evaluating for asthma first 1
  • Accepting a single failed treatment as definitive - the 2-month omeprazole trial may have been inadequate (GERD treatment requires high-dose PPI, often with prokinetics, for up to 3 months) 1, 2
  • Missing the significance of atopy as a strong predictor of asthma 3

If this patient fails to respond to asthma therapy: Then reconsider GERD with more intensive treatment (high-dose PPI twice daily, prokinetic agents, dietary modifications) and consider 24-hour esophageal pH monitoring 1, 2. However, nonasthmatic eosinophilic bronchitis (NAEB) should also be evaluated with induced sputum before pursuing extensive GERD workup 1.

The algorithmic approach is critical: UACS → Asthma/NAEB → GERD 1. This patient has appropriately ruled out UACS and now requires evaluation for asthma before concluding GERD is the cause.

References

4
Research

Evaluation and management of chronic cough in adults.

Allergy and asthma proceedings, 2023

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