When the airways constrict during an asthma attack, this causes the air delivery to be ‘patchy’. Some patches of lung get a small amount of air, and others get more air than usual.
- Gas exchange is worse
- The breathing muscles have to work harder to breathe
- Much more energy is required just to breathe, which is distressing for the patient
In this model:
- Green is good
- Red is too high
- Blue is too low