What may prevent a good mask fit in NIV according to its contraindications?

Facial deformities can significantly impact the fit of a noninvasive ventilation (NIV) mask, which is crucial for effective therapy. A good mask fit ensures that there is an adequate seal between the mask and the patient’s face to prevent air leaks, which can reduce the effectiveness of the ventilation support being provided. Facial deformities may lead to irregular contours that make it difficult to achieve a tight and effective seal. This can result in air escaping from the edges of the mask, reducing the pressure delivered and compromising the patient's respiratory support.

While recent surgery, excessive weight, and patient age can influence overall patient health and comfort, they do not directly prevent achieving a good mask fit as consistently as facial deformities do. For example, while excessive weight might present challenges in fitting certain types of masks, modifications can often be made to accommodate larger patients. Similarly, post-surgery patients might be sensitive but may still achieve a proper mask fit depending on surgical site and healing status. Age, while it can influence anatomical changes, does not inherently cause issues with mask fitting to the same degree as distinct facial deformities.