What does pursed-lip breathing primarily promote in clients with emphysema?

Pursed-lip breathing primarily promotes carbon dioxide elimination in clients with emphysema by slowing down the expiration phase of breathing. This technique helps to create a back pressure in the airways, which opens the airways and prevents collapse during exhalation. As a result, it allows for more prolonged and effective expulsion of stale air that is high in carbon dioxide.

By controlling the breathing pattern, pursed-lip breathing can also enhance ventilation by maintaining positive airway pressure, which leads to an increased time for gas exchange. This method is particularly beneficial for individuals with emphysema, as they often struggle with air trapping and reduced expiratory flow rates. Thus, through the effective removal of carbon dioxide and the reduction of air trapping, pursed-lip breathing can alleviate some symptoms associated with the disease and improve overall respiratory function.