Which of the following is considered a disadvantage of using a full face mask?

The statement that increased deadspace and risk of pressure sores represents a disadvantage of using a full face mask is accurate. Full face masks cover both the nose and mouth, which can lead to an increase in dead space—the area where there is no gas exchange occurring. This can result in less effective ventilation, requiring adjustments to the ventilatory settings to compensate for the inability to utilize all available airflow effectively.

Additionally, the design of full face masks can contribute to the development of pressure sores. Since the mask must be fitted tightly to ensure a proper seal and prevent air leaks, it can exert pressure on facial areas, leading to skin breakdown over time, particularly if the mask is worn for extended periods.

In contrast, the other options suggest benefits that do not correspond with the disadvantages commonly associated with full face masks. Increased comfort and enhanced visibility would typically be characteristics that are favorable in choosing a mask for noninvasive ventilation. Improved patient communication is also more challenging with a full face mask than with other types of interfaces, as the covering of the mouth can make verbal communication difficult. Thus, considering the functional and practical implications of full face masks, the chosen option identifies a key drawback associated with their use.