Dynamic pulmonary hyperinflation

Hyperinflation is a compensatory mechanism which occurs in response to increased resistance of the airways. Hyperinflation allows for an increase in minute ventilation and improves the efficiency of the inspiratory intercostals. However, there are detrimental effects on the function of the diaphragm and the accessory muscles, which increase the work of breathing. The physiotherapist's inital goal is to enhance the action of the respiratory muscles and not to select strategies that will interfere with this compensatory mechanism. Once the underlying problem is stabilised, the physiotherapist may then use strategies which assist with the reversal of the problem.