In a patient with 11 days of cough, upper respiratory symptoms, and cough‑induced chest pain who has a history of asthma, should I obtain a chest radiograph (which view) and what antibiotic, if any, should be prescribed?

No Antibiotic Indicated; Obtain Chest X-ray (PA and Lateral) to Rule Out Pneumonia

For this patient with 11 days of cough, upper respiratory symptoms, and asthma history, you should obtain a chest radiograph but withhold antibiotics unless pneumonia is confirmed on imaging. The chest pain is likely musculoskeletal from coughing, but the duration and asthma history warrant imaging to exclude pneumonia before committing to antibiotics.

Clinical Assessment for Pneumonia

The CHEST guidelines 1 specify that pneumonia should be suspected when patients present with:

• Cough with dyspnea or pleural pain
• Fever ≥38°C (100.4°F)
• Tachypnea
• New localizing chest examination findings (crackles, diminished breath sounds)
• Absence of rhinorrhea (important negative predictor)

Key point: If your patient has prominent rhinorrhea or lacks fever, dyspnea, and abnormal lung sounds, pneumonia becomes less likely. However, at 11 days duration with chest pain, imaging is still warranted given the asthma history.

Chest Radiography Recommendation

Order a standard PA (posteroanterior) and lateral chest X-ray 1. The CHEST guidelines recommend chest radiography for outpatients with suspected pneumonia when abnormal vital signs are present (Grade 2C) 1.

For patients with asthma specifically:

• Adult asthmatics admitted to hospital show major radiographic abnormalities in 34% of cases, including focal opacities, infiltrates, and pneumothorax 2
• These findings alter management independent of fever or leukocyte count 2
• In your case, the 11-day duration and chest pain justify imaging even if vital signs are normal, as complications like pneumonia or pneumothorax need exclusion

The standard two-view chest X-ray (PA and lateral) provides adequate sensitivity for pneumonia detection in this outpatient setting. CT is not indicated unless the chest X-ray is equivocal and clinical suspicion remains high 3.

Antibiotic Decision Algorithm

Do NOT prescribe antibiotics empirically at this stage. Follow this approach:

1. If chest X-ray shows pneumonia: Prescribe antibiotics per local CAP guidelines (typically amoxicillin or doxycycline for outpatient CAP)

2. If chest X-ray is normal:

   • This is likely acute bronchitis or viral upper respiratory infection
   • Antibiotics are NOT recommended for uncomplicated acute bronchitis 4
   • The principles of appropriate antibiotic use explicitly state that antibiotics should not be routinely used when there is no clinical or radiographic evidence of pneumonia 1

3. Consider CRP if available: A CRP <10 mg/L makes pneumonia unlikely; CRP ≥30 mg/L increases pneumonia likelihood when combined with suggestive symptoms 1

Asthma-Specific Considerations

Critical caveat: Your patient's asthma history changes the risk-benefit calculation:

• Asthmatic patients may develop transient bronchial hyperresponsiveness during acute respiratory infections that can last 2-3 weeks 4
• This is NOT an indication for antibiotics but may require optimization of bronchodilator therapy
• If wheezing is prominent, ensure adequate inhaled bronchodilator use (albuterol) rather than reflexively prescribing antibiotics

Do not confuse asthma exacerbation with bacterial infection. The chest pain from coughing is likely musculoskeletal and does not indicate bacterial pneumonia unless accompanied by fever, focal findings, or radiographic infiltrate.

Common Pitfalls to Avoid

• Don't prescribe antibiotics "just in case" at 11 days: Duration alone doesn't mandate antibiotics; most viral URIs can have prolonged cough
• Don't skip imaging in asthmatics with prolonged symptoms: They have higher rates of radiographic abnormalities that alter management 2, 5
• Don't mistake cough-induced chest wall pain for pleuritic pain: True pleuritic pain worsens with deep inspiration and suggests parenchymal involvement
• Don't order microbiological testing: Routine sputum cultures or viral panels are not recommended for outpatient suspected pneumonia 1

If Imaging Cannot Be Performed

Only if chest X-ray is truly unavailable should you consider empiric antibiotics, and only when clinical features strongly suggest pneumonia (fever ≥38°C, tachypnea, focal crackles, elevated CRP) 1. Otherwise, symptomatic treatment and reassurance are appropriate for acute bronchitis.