Persistent Cough After Bacterial Sinusitis

Understanding the Mechanism

The American College of Chest Physicians suggests that persistent cough after bacterial sinusitis occurs through two primary pathways: during active infection and postinfectious phase, with the cough being triggered by upper airway cough syndrome 1, 2, 3
The postinfectious phase is characterized by extensive disruption of epithelial integrity and widespread airway inflammation, causing cough that may last 3-8 weeks (subacute cough) 1, 3, 4

The American College of Chest Physicians notes that the cough from bacterial sinusitis can be either productive or nonproductive, with chronic sinusitis causing productive cough with excessive sputum (>30 mL/day) about one-third of the time 2, 5
The cough is frequently worse at night, which is a cardinal symptom of sinusitis, although this fact is from a less preferred source 7

Postinfectious cough is defined as lasting >3 weeks after acute symptoms but resolving within 8 weeks (subacute cough category), according to the American College of Chest Physicians 1, 3, 4
Chronic sinusitis (>90 days) is defined by persistent respiratory symptoms including cough, rhinorrhea, or nasal obstruction, as stated by the American College of Radiology 8

A history of upper respiratory tract infection is the key to diagnosis, as stated by the American College of Chest Physicians 5, 6
The pathogenesis involves extensive inflammation and disruption of upper and/or lower airway epithelial integrity, with possible mucus hypersecretion and transient airway hyperresponsiveness 1, 3, 4

The American College of Chest Physicians recommends first-generation antihistamine combined with a decongestant (e.g., pseudoephedrine) as the treatment for postinfectious cough following bacterial sinusitis 5, 6
Inhaled ipratropium may be helpful for lower airway involvement, as suggested by the American College of Chest Physicians 1, 3

The American College of Chest Physicians advises against assuming all persistent cough after sinusitis requires continued antibiotics, as most postinfectious cough is not due to ongoing bacterial infection 1, 3
Alternative diagnoses should be considered if cough persists beyond 8 weeks, including asthma, gastroesophageal reflux, or underlying conditions like allergic rhinitis, as stated by the American College of Chest Physicians and the American College of Radiology 1, 3, 8