PANCE Blueprint Pulmonary (9%)

Acute bronchitis (ReelDx)

REEL-DX-ENHANCED-PAID-MEMBERS-ONLY

Acute Bronchitis

26 y/o female with acute onset of cough and dyspnea during pregnancy

Patient will present as → a 45-year-old female presents to the clinic with a 5-day history of cough and feeling generally unwell. She reports the cough started as a dry, irritating cough but has since progressed to a productive cough with yellowish sputum. She denies any shortness of breath or wheezing but mentions mild chest discomfort with coughing. She also reports a low-grade fever and malaise. On examination, her temperature is 37.8°C (100.4°F), her respiratory rate is 18 breaths per minute, and her oxygen saturation is 98% on room air. Scattered rhonchi are heard throughout all lung fields. A diagnosis of acute bronchitis is made. The patient is advised about the viral nature of most acute bronchitis cases, meaning antibiotics are not indicated. She is counseled on symptomatic management, including increased fluid intake, rest, and over-the-counter cough suppressants and analgesics as needed for comfort. She is advised to return if symptoms worsen or if she develops shortness of breath, high fever, or persistent symptoms beyond a few weeks. A follow-up phone call in a week is scheduled to assess her progress.

Acute bronchitis is an inflammation of the bronchial tubes (the airways that carry air to the lungs)

  • It typically develops from a cold or other respiratory infection and is characterized by the production of mucus (sputum), coughing, and sometimes shortness of breath and wheezing
  • Symptoms include persistent cough (lasting more than 5 days, up to 3 weeks) that may be productive (yellow sputum), white nasal discharge, sore throat, and fatigue
  • Auscultation of the lungs may reveal scattered rhonchi or wheezing, which often clears with coughing
  • A low-grade fever is common - but a high fever is unusual in acute bronchitis. If your patient has a fever, consider pneumonia
  • Most cases (over 90%) of acute bronchitis are viral (e.g., influenza, rhinovirus, coronavirus)
  • Bacteria, such as Mycoplasma pneumoniae, Bordetella pertussis, and Chlamydia pneumoniae, cause less than 10% of cases and sometimes occur in outbreaks

Chest X-ray if the diagnosis is uncertain or symptoms have persisted despite conservative treatment

Since most cases (over 90%) are viral, symptomatic treatment is the cornerstone of management:

  • Supportive measures include hydration, expectorants, analgesics, β2-agonists, and cough suppressants as needed (not recommended for children)
  • For patients who desire medication for cough, offer over-the-counter medications such as dextromethorphan or guaifenesin rather than other medications
    • Reserve use of inhaled beta-agonists, such as albuterol, for patients with wheezing and underlying pulmonary disease
  • Antibiotics are not recommended for acute bronchitis. Purulent (yellow or green) sputum does not predict a bacterial infection or a response to antibiotics
  • Reserve antimicrobials for a specific suspected or confirmed pathogen: pertussis (a macrolide such as azithromycin is first-line) or influenza in a high-risk patient (oseltamivir)
  • Fever above 38°C (100.4°F), other abnormal vital signs, or focal lung findings suggest pneumonia: obtain a chest x-ray
  • Acute exacerbations of chronic bronchitis (COPD) are a different condition and are managed separately
Question 1
A 62-year-old male with a significant smoking history presents with a 6-day history of dry cough and low-grade fever. You suspect acute bronchitis. Which of the following is the most appropriate initial management?
A
Azithromycin 500mg day 1, then 250mg daily for 4 days
Hint:
Antibiotics which are usually not indicated in the treatment of acute bronchitis
B
Amoxicillin 875mg twice daily for 7 days
Hint:
Antibiotics are usually not indicated in the treatment of acute bronchitis
C
Increased fluids and ibuprofen
D
Give the patient an albuterol inhaler
Hint:
Albuterol, is a beta-agonist used as a bronchodilator (usually in asthma); here, it should be used only if there is evidence of bronchoconstriction.
E
Chest x-ray and sputum culture
Hint:
These are typically reserved for patients with suspected complications, signs of pneumonia, or those who aren't improving with supportive care.
Question 1 Explanation: 
Acute bronchitis is usually caused by viruses and resolves on its own. Management focuses on symptom relief. Increased fluids help loosen secretions, and ibuprofen provides fever reduction and pain control.
Question 2
A 34-year-old man was seen 5 days ago for 4 days of cough and nasal congestion, was diagnosed with acute bronchitis, and was advised to rest and take antipyretics. He returns feeling worse. He now has a temperature of 38.6°C (101.5°F) and a cough productive of purulent sputum. His lungs are clear bilaterally, and his oxygen saturation is 98% on room air. Which of the following is the most appropriate next step in management?
A
Macrolide antibiotic
Hint:
Antibiotics are not recommended for acute bronchitis, and purulent sputum does not predict a bacterial infection or a response to antibiotics. A macrolide is reserved for suspected pertussis, which this presentation does not suggest. Before treating for pneumonia, confirm it.
B
Chest radiograph
C
Oral corticosteroid
Hint:
Oral corticosteroids have no role in uncomplicated acute bronchitis and do not address the new concern here, which is possible pneumonia.
D
Pulmonary function testing
Hint:
Pulmonary function tests evaluate chronic airflow obstruction such as asthma or COPD. They do not help distinguish bronchitis from pneumonia in an acutely febrile patient.
E
Sputum culture
Hint:
Sputum culture is not routinely needed in acute bronchitis and does not come before a chest radiograph when pneumonia is a concern.
Question 2 Explanation: 

Acute bronchitis is usually viral and is treated without antibiotics, but a new fever in a patient who is getting worse should raise concern for pneumonia, which is confirmed or excluded with a chest radiograph. Fever is uncommon in uncomplicated acute bronchitis. A temperature above 38°C (100.4°F), abnormal vital signs, or focal lung findings mean the examination alone cannot rule out pneumonia, so imaging is the next step.

If the radiograph shows an infiltrate, treat community-acquired pneumonia. If it is clear, continue supportive care. Purulent sputum does not predict a bacterial cause or a response to antibiotics, so a macrolide should not be prescribed empirically; in acute bronchitis, antibiotics are reserved for a specific pathogen such as pertussis (a macrolide is first-line).

Question 3
What is the most common cause of acute bronchitis?
A
Streptococcus pneumoniae
Hint:
Bacteria cause fewer than 10% of cases of acute bronchitis. When bacteria are responsible, the most common are Bordetella pertussis, Mycoplasma pneumoniae, and Chlamydia pneumoniae, not the typical upper respiratory pathogens (S. pneumoniae, H. influenzae, M. catarrhalis).
B
Respiratory viruses
C
Haemophilus influenzae
Hint:
Bacteria cause fewer than 10% of cases of acute bronchitis. When bacteria are responsible, the most common are Bordetella pertussis, Mycoplasma pneumoniae, and Chlamydia pneumoniae, not the typical upper respiratory pathogens (S. pneumoniae, H. influenzae, M. catarrhalis).
D
Mycoplasma pneumoniae
Hint:
Causes "atypical" pneumonia and can occasionally include a bronchitis component, but usually isn't the single-leading reason for an acute uncomplicated bronchitis-like picture.
E
Moraxella catarrhalis
Hint:
Bacteria cause fewer than 10% of cases of acute bronchitis. When bacteria are responsible, the most common are Bordetella pertussis, Mycoplasma pneumoniae, and Chlamydia pneumoniae, not the typical upper respiratory pathogens (S. pneumoniae, H. influenzae, M. catarrhalis).
Question 3 Explanation: 
Respiratory viruses are the most common cause of acute bronchitis, accounting for over 90% of cases, particularly in otherwise healthy individuals. Common viruses include influenza, parainfluenza, coronavirus, rhinovirus, respiratory syncytial virus (RSV), and human metapneumovirus. The condition is typically self-limited, lasting 1–3 weeks, and usually does not require antibiotics. Auscultation may reveal rhonchi or wheezing, but no signs of consolidation. The absence of systemic toxicity, focal findings, or signs of pneumonia supports a viral etiology.
Question 4
Which of the following is recognized as an effective preventive measure against acute bronchitis?
A
Starting Oseltamivir 75 mg within the first two days of symptom onset
Hint:
Starting Oseltamivir 75 mg within the first two days of symptom onset is aimed at treating influenza rather than serving as a prophylaxis for acute bronchitis. While it can reduce the severity and duration of influenza, it is not a preventive measure for bronchitis itself.
B
Receiving the influenza vaccination
C
Using inhaled corticosteroids regularly
Hint:
Using inhaled corticosteroids is typically part of the treatment regimen for chronic respiratory conditions like asthma or COPD to reduce inflammation and prevent exacerbations, not as a prophylaxis for acute bronchitis.
D
Vitamin C daily
Hint:
Common misconception about cold prevention despite lack of strong evidence
E
Amoxicillin pulse dosing
Hint:
Not a recommended preventive measure
Question 4 Explanation: 
The influenza vaccine is an effective prophylaxis against acute bronchitis, particularly because influenza is a common cause of respiratory infections that can lead to bronchitis. By preventing influenza, the vaccine indirectly reduces the risk of developing secondary complications such as acute bronchitis.
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References: Merck Manual · UpToDate

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