What does pursed lips breathing involve?

Pursed lip breathing is a technique aimed at improving ventilation and reducing shortness of breath, commonly used by individuals with respiratory conditions such as chronic obstructive pulmonary disease (COPD). The correct answer involves taking a deep breath in through the nose, which allows for the inhalation of air to fill the lungs efficiently. The exhalation is through pursed lips, which creates a slight resistance and helps keep the airways open longer, facilitating better gas exchange.

This method is beneficial because it prolongs the exhalation phase, which can help in preventing air trapping in the lungs and improving oxygenation, ultimately enhancing overall respiratory function. The emphasis on inhaling through the nose promotes a more controlled intake of air, while the pursing of the lips during exhalation aids in maintaining pressure within the airways, thus optimizing the flow of air and reducing the work of breathing.