Cough Presentation and Diagnosis in Bronchitis

Definition and Types of Cough

Acute bronchitis typically manifests as cough with or without phlegm production that lasts up to 3 weeks 1, 2
The cough in bronchitis can initially be dry before developing into a productive cough with sputum 2, 3
The distinction between dry and productive cough is not always clear-cut in bronchitis, as patients may transition between cough types during the course of illness 4

Bronchitis involves inflammation of the airways that activates the afferent limb of the cough reflex 5
Viral infections account for more than 90% of acute bronchitis cases, triggering mucosal injury and epithelial cell damage 6
The inflammatory process can cause a dry, irritating cough before mucus production increases 2, 6
Heightened cough receptors in bronchitis patients lead to increased sensitivity to irritants 5

Acute bronchitis is defined as an acute respiratory infection with cough lasting no more than 3 weeks 1, 7
Diagnosis requires ruling out pneumonia, common cold, acute asthma, or COPD exacerbation 7, 3
The cough may be accompanied by constitutional symptoms such as fever, muscle aches, and fatigue 1, 2
Cough associated with the common cold is often related to upper airway cough syndrome with throat clearing and postnasal drip sensation 1, 8
Asthma is commonly misdiagnosed as acute bronchitis in approximately one-third of patients presenting with acute cough 7, 8

Transient airflow obstruction and bronchial hyperresponsiveness can occur in approximately 40% of previously healthy individuals with acute respiratory infections 6
In most patients, airflow obstruction and bronchial hyperresponsiveness resolve within 6 weeks 6
Failing to recognize when "acute bronchitis" might actually be an early presentation of chronic respiratory conditions like asthma 7, 8