Clinical Scenario:
A 13-year-old boy with a known history of bronchial asthma is admitted with a severe acute exacerbation. He receives repeated nebulized salbutamol, ipratropium bromide, systemic corticosteroids, oxygen, and intravenous magnesium sulfate.
Two hours later, he suddenly develops severe right-sided pleuritic chest pain with marked worsening of respiratory distress. His oxygen saturation falls from 95% to 82% despite oxygen therapy.
On examination:
- Respiratory rate: 48/min
- Heart rate: 150/min
- Trachea deviated to the left
- Markedly reduced chest expansion on the right
- Hyperresonant percussion note over the right hemithorax
- Absent breath sounds over the right lung
What is the most likely diagnosis?
A. Massive mucus plugging
B. Right-sided tension pneumothorax
C. Status asthmaticus
D. Lobar pneumonia
E. Acute pulmonary edema
Correct answer & Explanation:
Correct Answer: B. Right-sided tension pneumothorax
Explanation
This child has developed a right-sided tension pneumothorax, a rare but life-threatening complication of acute severe asthma. Excessive intrathoracic pressure during severe bronchospasm may cause alveolar rupture, allowing air to enter the pleural space. Progressive accumulation of intrapleural air under pressure causes lung collapse and mediastinal shift.
The diagnosis is clinical and should not be delayed while awaiting imaging.
The features strongly suggestive of tension pneumothorax are:
- Sudden deterioration after initial treatment
- Acute pleuritic chest pain
- Rapid worsening of hypoxemia
- Tracheal deviation away from the affected side
- Hyperresonance to percussion
- Absent unilateral breath sounds
- Markedly reduced chest expansion on the affected side
Immediate management is emergency needle decompression followed by intercostal chest drain insertion.
Why the other options are incorrect
A. Massive mucus plugging
May cause unilateral reduced breath sounds or lobar collapse but does not cause hyperresonance or tracheal deviation away from the affected side.
B. Right-sided tension pneumothorax
Correct. The sudden onset of pleuritic chest pain, severe hypoxemia, unilateral absent breath sounds, hyperresonance, and contralateral tracheal deviation is classic.
C. Status asthmaticus
Usually causes bilateral widespread wheeze or a silent chest. It does not explain unilateral absent breath sounds with hyperresonance and mediastinal shift.
D. Lobar pneumonia
Typically develops over hours to days and produces localized crackles and dullness to percussion rather than hyperresonance.
E. Acute pulmonary edema
Would present with bilateral crackles and diffuse respiratory findings rather than unilateral absent breath sounds.
Learning Point
In a child with acute severe asthma who suddenly deteriorates, always suspect complications such as:
- Tension pneumothorax
- Pneumomediastinum
- Mucus plug causing lobar collapse
The combination of sudden pleuritic chest pain, unilateral absent breath sounds, hyperresonance, and tracheal deviation is diagnostic of tension pneumothorax and requires immediate decompression without waiting for a chest radiograph.
