Acute Bronchitis Management

Diagnosis

• Most cases (>90%) of acute bronchitis are viral in origin, typically resolving in about 10 days, and purulent sputum alone is not an indication for antibiotics, as stated by the American College of Physicians and the European Respiratory Society 1
• Differentiate from pneumonia, as pneumonia is unlikely in the absence of all of the following: tachycardia, tachypnea, fever >38°C, and abnormal chest examination findings, as stated by the American College of Physicians 2

Treatment

• The benefit of antibiotic therapy on disease course or complications has not been confirmed in clinical trials versus placebo, according to the American College of Physicians 1
• Fever persisting more than 7 days suggests bacterial superinfection, and when atypical pathogens are suspected (Mycoplasma pneumoniae, Chlamydia pneumoniae, or Bordetella pertussis), antibiotic therapy may be considered, as recommended by the American College of Physicians and the Infectious Diseases Society of America 1, 2
• Consider symptomatic treatment, as cough suppressants, expectorants, and bronchodilators may provide symptomatic relief without antibiotics, according to the American Academy of Family Physicians 2
• Antibiotics are not recommended for acute bronchitis in healthy adults, even with purulent sputum, as the clinical course is typically self-limited, resolving in about 10 days 1

Antibiotic Therapy

• The approach to antibiotic therapy depends on the type of bronchitis, with amoxicillin as the first-line antibiotic for bacterial bronchitis, and selection of alternative antibiotics based on disease severity, patient risk factors, and presence of obstructive lung disease 1
• Antibiotic therapy should target the most common bacterial pathogens, including Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis 1
• The standard duration of antibiotic therapy is 5-7 days for most antibiotics, with azithromycin having a 3-day course (500mg daily) shown to be comparable in efficacy to longer courses of other antibiotics 1
• Alternative antibiotic options include:
• Local resistance patterns should be considered, particularly for pneumococci with decreased susceptibility to penicillins and macrolides, and fluoroquinolones should be reserved for patients with severe disease, treatment failures, or significant risk factors due to concerns about resistance development 1

Chronic Bronchitis Exacerbations

• Chronic bronchitis exacerbations are classified based on severity, including simple chronic bronchitis (FEV1 >80%), obstructive chronic bronchitis (FEV1 35-80%), and obstructive chronic bronchitis with respiratory insufficiency (FEV1 <35%) 1

• The American Thoracic Society and the American College of Chest Physicians recommend the following treatment approach for chronic bronchitis exacerbations:

  Type	Description	Treatment
  Simple chronic bronchitis	No immediate antibiotic therapy recommended, even with fever, unless fever persists for more than 3 days	Amoxicillin as first-line therapy for infrequent exacerbations [1]
  Chronic obstructive bronchitis	Immediate antibiotics recommended if at least two of the Anthonisen criteria are present (increased dyspnea, increased sputum volume, increased sputum purulence)	Amoxicillin as first-line therapy [1]
  Chronic obstructive bronchitis with respiratory insufficiency	Immediate antibiotic therapy recommended	Amoxicillin as first-line therapy [1]

Clinical Reassessment and Monitoring

• Clinical reassessment is recommended if initial symptomatic treatment fails, to determine the need for antibiotics after 2-3 days 1
• Risk factors for treatment failure include frequent exacerbations (≥4 per year), FEV1 <35%, advanced age (>65 years), and significant comorbidities, and these patients should be closely monitored and considered for alternative antibiotic therapies 1
• The American College of Physicians recommends considering antibiotic indications for symptoms persisting >7 days, fever >38°C for >3 days, or in patients with underlying COPD 2