How is ventilation delivered using a bag-mask device?

Ventilation using a bag-mask device is delivered by giving one breath over the course of one second. This rate helps ensure that ventilation is effective without causing excessive pressure in the lungs or overinflating the chest. Each breath should be delivered to achieve visible chest rise, which indicates that air is entering the lungs.

Delivering one breath over one second strikes a balance that accommodates the needs of the patient while minimizing the risk of complications such as barotrauma or gastric inflation. This technique is essential in maintaining oxygenation during a cardiac arrest or respiratory distress, where effective ventilation is crucial for patient survival.