Management of Acute Bronchitis

Initial Assessment and Diagnosis

The American College of Chest Physicians recommends ruling out other conditions such as pneumonia, asthma, or COPD exacerbation before diagnosing acute bronchitis, as the absence of certain findings (heart rate >100 beats/min, respiratory rate >24 breaths/min, oral temperature >38°C, focal chest examination findings) makes pneumonia unlikely and eliminates the need for chest radiography 1, 3
The presence of purulent sputum does not reliably indicate bacterial infection and should not be used as a criterion for antibiotic therapy, with a strength of evidence rated as high 4, 1

No routine investigations, including chest x-ray, spirometry, peak flow measurement, sputum cultures, viral PCR, and serum inflammatory markers, are recommended for uncomplicated acute bronchitis, as they do not provide significant diagnostic or therapeutic benefits 1, 2

The American College of Chest Physicians recommends against the routine use of antibiotics for acute bronchitis in immunocompetent adults, as they may reduce cough duration by only approximately 0.5 days but expose patients to adverse effects, with a strength of evidence rated as moderate 1, 2, 3
Antibiotics may be considered in select cases, such as significant worsening of symptoms, suspected bacterial superinfection, or high-risk patients (e.g., age ≥65 years), with a strength of evidence rated as low 1, 2, 4
β2-agonist bronchodilators should not be routinely prescribed for cough in acute bronchitis, but may be considered in select adult patients with wheezing accompanying the cough, with a strength of evidence rated as moderate 3
Antitussive agents may provide short-term symptomatic relief of coughing in selected cases, but mucokinetic agents are not recommended due to lack of consistent favorable effects, with a strength of evidence rated as low 3

If symptoms persist or worsen, consider reassessment and targeted investigations, such as chest x-ray, sputum for microbial culture, peak expiratory flow measurements, complete blood count, and inflammatory markers, with a strength of evidence rated as moderate 1, 2
Approximately 65% of patients with recurrent episodes of acute bronchitis may have underlying mild asthma, and other potential diagnoses include cough-variant asthma, COPD, or bronchiectasis, with a strength of evidence rated as moderate 1, 2, 4, 3