Which factor contributes most to optimal bag-mask ventilation in 1-rescuer BLS?

Which factor contributes most to optimal bag-mask ventilation in 1-rescuer BLS?

• A. Proper mask seal
• B. Head tilt-chin-lift maneuver
• C. Compress bag until chest rise
• D. Supplemental oxygen

Answer: (A)

A good mask seal is the most crucial factor because it prevents air from leaking around the mask and ensures the delivered breaths reach the lungs. Even with the airway opened (head tilt-chin-lift) and the bag squeezed correctly, a poor seal means most of the air escapes and chest rise may be inadequate. While opening the airway and delivering breaths are important, they can’t compensate for a leak. Supplemental oxygen helps oxygenation but doesn’t fix a poor seal, so achieving and maintaining a tight seal is what makes bag-mask ventilation effective in one-rescuer BLS.

A good mask seal is the most crucial factor because it prevents air from leaking around the mask and ensures the delivered breaths reach the lungs. Even with the airway opened (head tilt-chin-lift) and the bag squeezed correctly, a poor seal means most of the air escapes and chest rise may be inadequate. While opening the airway and delivering breaths are important, they can’t compensate for a leak. Supplemental oxygen helps oxygenation but doesn’t fix a poor seal, so achieving and maintaining a tight seal is what makes bag-mask ventilation effective in one-rescuer BLS.