Management of Persistent Cough
Introduction to Cough Management
- The American Thoracic Society recommends stopping antibiotic prescriptions immediately, as they provide no benefit for postinfectious or chronic cough and contribute to antibiotic resistance 1, 2, 3.
Reassessing the Clinical Timeline and Diagnosis
- For patients with a cough duration of 3-8 weeks, the most common cause is postinfectious cough, which may be attributed to multiple pathogenic factors, including postviral airway inflammation, bronchial hyperresponsiveness, mucus hypersecretion, upper airway cough syndrome (UACS), asthma, or gastroesophageal reflux disease (GERD) 1, 5, 6, 8.
- Antibiotics have no role in the treatment of postinfectious cough, as the cause is not bacterial infection 1, 2, 3, 6.
Evidence-Based Treatment Algorithm
- The American College of Chest Physicians recommends inhaled ipratropium bromide as the first-line treatment for postinfectious cough, with fair evidence (Grade B) 1, 5, 8, 2, 3.
- Adding a first-generation antihistamine/decongestant combination may be beneficial if upper airway symptoms are present 10, 11.
- Inhaled corticosteroids should be considered when cough persists despite ipratropium and adversely affects quality of life 1, 5, 8, 2, 3, 9.
Sequential Evaluation for Chronic Cough
- If the cough has persisted beyond 8 weeks, evaluate and treat UACS, asthma, non-asthmatic eosinophilic bronchitis (NAEB), and GERD systematically 10, 11.
- Refer to pulmonology when cough persists beyond 8 weeks despite systematic empiric treatment of common causes 10, 11.
Critical Pitfalls to Avoid
- Long-term macrolide antibiotics are ineffective for chronic cough based on randomized controlled trials 13.
- Don't assume GERD without clinical features, and empiric proton pump inhibitor therapy is not recommended for unexplained chronic cough 4.
- Don't use cough suppressants when the cough is productive and helping clear mucus 12.
- Don't overlook ACE inhibitor-induced cough—stop the medication and replace it 10, 11.