What should be ensured for a proper fit of a bag-mask during ventilation?

For effective bag-mask ventilation, it is essential that the mask fits properly to create an adequate seal around the patient's airway. A mask that extends from the bridge of the nose down to below the chin is designed to cover both the mouth and the nose effectively, ensuring that air can be delivered to the lungs without escaping around the edges of the mask. This coverage is critical because it positions the mask to properly align over the anatomical landmarks of the face, allowing for a secure fit that minimizes air leaks during ventilation.

Furthermore, a properly fitted mask avoids excessive pressure on sensitive areas such as the eyes or forehead—features that would be compromised if the mask does not extend adequately or is improperly positioned. This ensures not only the effectiveness of each ventilation breath but also the comfort and safety of the patient.