In which circumstance might a full face mask be more appropriate?

A full face mask is particularly suitable for patients who have difficulty keeping their mouth closed. This situation arises because a full face mask covers both the nose and mouth, allowing for effective airflow even if the patient breathes through their mouth during sleep. Patients who are unable to maintain a closed mouth, whether due to anatomical issues, nasal congestion, or sleep position, benefit significantly from a full face mask as it provides a reliable seal and minimizes the risk of therapy failure.

In contrast, if airflow through the nose is restricted, while a full face mask might seem beneficial, a nasal mask could sometimes still be effective if other strategies are employed (such as decongestants). When a patient can easily keep their mouth closed, a nasal mask is often sufficient and more comfortable as it is less obtrusive. For those who express a preference for a nasal mask, it indicates comfort and user-friendliness, critical factors that can enhance adherence to therapy. Thus, the choice of a full face mask is specifically aligned with the needs of patients who struggle with maintaining a closed mouth while sleeping.