What is the purpose of CPAP in severe asthma treatment?

The purpose of Continuous Positive Airway Pressure (CPAP) in the treatment of severe asthma primarily revolves around its ability to assist with ventilation. In patients experiencing severe asthma exacerbations, airflow limitation can lead to significant respiratory distress and inadequate ventilation.

By applying CPAP, a continuous pressure is maintained in the airways, which helps to keep them open even during the patient's effort to exhale. This prevents airway collapse and facilitates the exchange of gases—improving overall ventilation. Additionally, CPAP can enhance the distribution of airflow in the lungs, making it easier for patients to breathe, thus directly addressing the severe hypoxia that often accompanies asthma exacerbations.

While oxygen concentration can be improved with CPAP, its primary function in this context is not just about increasing oxygen levels but rather enhancing the overall mechanical aspect of ventilation. Reducing anxiety can be a secondary benefit for some patients, but it is not the principal purpose of CPAP in this scenario. Furthermore, CPAP does not directly facilitate medication administration; rather, its role is to provide respiratory support.