Where should the lower part of the nasal mask fit in relation to the patient’s facial features?

The appropriate placement of the lower part of the nasal mask is just above the upper lip. This position is crucial for ensuring an effective seal between the mask and the patient's face, which is essential for properly delivering positive pressure ventilation. When the mask sits just above the upper lip, it can effectively cover the nose and part of the surrounding facial area without obstructing the mouth or impeding comfort.

Positioning the mask too close to the nostrils may cause discomfort and limit airflow, as well as increase the likelihood of the mask shifting during use. Sitting below the jawline would create gaps that can lead to leaks and ineffective ventilation. Placing the mask along the chin could displace the structure of the mask and lead to an improper fit, also reducing the effectiveness of the ventilation.

Thus, fitting the lower part of the nasal mask just above the upper lip is essential for achieving the best interface for noninvasive ventilation while maintaining patient comfort.