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Pneumomediastinum

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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Air in the mediastinum.

Most common cause is rupture of the alveoli (air then enters the interstitial tissues and tracks to the mediastinum). Causes include:

  • raised intrapulmonary pressures e.g. vomiting, asthma, coughing
  • positive pressure mechanical ventilation

Other causes include:

  • penetrating neck injury
  • oesophageal and bronchial rupture

Clinical features:

  • may be asymptomatic
  • chest pain that is worse on swallowing or breathing
  • crunching sound coincident with each heart beat

Chest X-ray:

  • air in the upper mediastinum, around the heart, or within the soft tissues of the neck
  • pneumothorax in 30% of cases

Treatment:

  • treat underlying cause
  • treatment with high concentration inspiratory oxygen can hasten resolution

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The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

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