Loss of surfactant function
 
 
- Enhanced conversion to small aggregate forms of lipids
- Decreased pool size from different lung injury
- Mechanical factors, e.g. alveolar collapse
  Notes: 
  
  
Surfactant quantity and composition may be reduced as a result of different lung injury. In certain situations the complete structure is damaged, while in others only one part is damaged, or the quantity produced is insufficient for therapeutic requirements.