Which factor can contribute to poor ventilation despite the correct use of a bag-valve-mask device?

A factor that can contribute to poor ventilation, even when using a bag-valve-mask device correctly, is an improper seal on the mask. Achieving a tight seal between the mask and the patient’s face is critical for effective ventilation. If there are gaps due to an incorrect fit, air can escape instead of entering the lungs, which reduces the overall effectiveness of the ventilation efforts.

Proper sealing ensures that the positive pressure generated by the bag is effectively transmitted to the airway, allowing for adequate oxygen delivery and carbon dioxide removal. This is especially important in patients with facial trauma, obesity, or unusual anatomical features, where the mask may not naturally conform to the shape of the face. Therefore, ensuring a proper fit and seal is fundamental in maximizing the effectiveness of the bag-valve-mask device for ventilation.