Acute bronchitis
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Acute Bronchitis: Causes and Pathophysiology
Acute bronchitis is an infection of the bronchi, the large airways in the lungs, and is most commonly caused by viruses such as influenza A and B, rhinoviruses, enteroviruses, parainfluenza, respiratory syncytial virus (RSV), coronavirus, and adenovirus. Bacterial causes are much less common, with Bordetella pertussis, Mycoplasma pneumoniae, and Chlamydia pneumoniae being the main exceptions, especially in certain outbreaks or specific populations. Streptococcus pneumoniae and Haemophilus influenzae are rarely implicated in otherwise healthy adults without underlying lung disease, though they can cause superinfections after a viral illnessWilson2021Gonzales2000Kinkade2016+1 MORE.
The infection leads to inflammation and narrowing of the bronchi, resulting in cough and mucus production. The cough is the most prominent symptom and can last from one to three weeks, sometimes up to six weeks, but the illness is generally self-limitingWilson2021Gonzales2000Kinkade2016+1 MORE.
Symptoms and Diagnosis of Acute Bronchitis
The main symptom of acute bronchitis is a persistent cough, which may or may not produce sputum. Other symptoms can include mild fever, malaise, and sometimes wheezing. The presence or color of sputum does not reliably distinguish between viral and bacterial infectionsGonzales2000Kinkade2016Albert2010.
Diagnosis is clinical and based on the presence of an acute cough without signs of pneumonia (such as tachypnea, tachycardia, or abnormal lung findings). Diagnostic testing is usually not needed unless there is suspicion for pneumonia, influenza, COVID-19, or other specific conditionsKinkade2016Mulhem2025Albert2010.
Treatment and Management: Antibiotics and Symptom Relief
Most cases of acute bronchitis are caused by viruses, so antibiotics are generally not recommended. Multiple studies and reviews have shown that antibiotics provide little to no benefit for most patients, reducing the duration of cough by only about half a day, and do not improve overall clinical outcomes. Antibiotic use also increases the risk of side effects and contributes to antibiotic resistanceWilson2021Gonzales2000Llor2016+5 MORE.
Symptomatic treatment is the main approach, including increased fluid intake and painkillers for comfort. Evidence does not support the use of antitussives, honey, antihistamines, anticholinergics, NSAIDs, or corticosteroids for routine management. Patient education about the expected duration of symptoms and reassurance are importantWilson2021Kinkade2016Mulhem2025+1 MORE.
Overprescription of Antibiotics: Causes and Solutions
Despite clear evidence, antibiotics are still frequently prescribed for acute bronchitis, often due to patient expectations or uncertainty in diagnosis. Strategies to reduce unnecessary antibiotic use include delayed prescriptions, patient education, and referring to the illness as a "chest cold" rather than bronchitisLlor2016Kinkade2016Mulhem2025+1 MORE.
Special Considerations and Future Directions
Acute bronchitis should be distinguished from other causes of cough, such as pneumonia, asthma, or exacerbations of chronic lung disease, as these may require different treatments. In frail elderly patients or those with multiple health conditions, antibiotics may have a modest benefit, but this must be weighed against potential harmsGonzales2000Smith2017Albert2010.
Further research is needed to better differentiate subtypes of acute bronchitis and to individualize treatment, but for now, supportive care remains the standardVerheij1989Virgili2023.
Conclusion
Acute bronchitis is a common, self-limiting respiratory illness, usually caused by viruses. Antibiotics are rarely needed and provide minimal benefit for most patients. The best management is supportive care, patient education, and avoidance of unnecessary antibiotics to prevent side effects and resistance. Clear communication and evidence-based strategies can help align clinical practice with current guidelines.
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