Hyperinflation paediatric x ray criteria

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pediatric chest radiograph hyperinflation criteria posterior ribs diaphragms

On a well-inspired pediatric chest radiograph, hyperinflation is suggested by:

More than 9 posterior ribs visible above the diaphragm.
- 7 to 9 posterior ribs is generally considered appropriate lung inflation.
- Fewer than 7 suggests low lung volume.
Some references use >10 posterior ribs or >6 anterior ribs above the diaphragm as a more definite threshold, especially in older children.
Low, flattened hemidiaphragms, sometimes with reduced diaphragmatic dome contour.
Increased lung lucency with relatively sparse peripheral vascular markings.
On lateral view, increased retrosternal airspace may support the finding, though this is less useful in small children.

Interpret only after checking technique: AP portable films, crying, rotation, and degree of inspiration can make rib counts and apparent lung volume misleading. The European Society of Paediatric Radiology recommends at least 8 posterior ribs above the diaphragm as adequate inspiration, while more than 9 is commonly used for hyperinflation. ESPR pediatric chest imaging recommendations

For unilateral air trapping from suspected foreign-body aspiration, obtain expiratory or bilateral decubitus views: the affected side remains relatively lucent and fails to deflate on expiration.

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