Hyperinflation in xray

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Quick answer

Hyperinflation on a chest X-ray means the lungs contain more air than normal, usually because air is trapped during exhalation. It is commonly seen in COPD, especially emphysema, and sometimes in acute asthma.
Typical X-ray features:
  • Low, flattened diaphragms
  • Increased lung volume: often more than 6 anterior ribs or 10 posterior ribs visible above the diaphragm on a good inspiratory film
  • Hyperlucent lungs: lungs look darker because of increased air
  • Widened intercostal spaces and more horizontal ribs
  • Long, narrow, vertically oriented heart ("small tubular heart")
  • Increased retrosternal clear space on lateral X-ray
  • In emphysema: reduced peripheral vascular markings and possible bullae
A chest X-ray can suggest hyperinflation, but spirometry is used to confirm airflow obstruction such as COPD.
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