What indicates a candidate fully understands the purpose of using a barrier device when ventilating a patient?

Using a barrier device for ventilating a patient primarily focuses on providing effective ventilation while maintaining the safety and protection of both the rescuer and the patient. Watching for the rise and fall of the patient's chest signifies that the rescuer is effectively delivering air into the lungs, which is the essential goal of using a barrier device. This observation ensures that the airway is open and unobstructed and that the ventilations are being successful, indicating that oxygen is being delivered to the patient appropriately.

While checking for a pulse, listening for breath sounds, or ensuring sterility are all important aspects of patient assessment and care, they do not directly confirm whether the barrier device is being utilized effectively during the ventilation process. The rise and fall of the patient’s chest provide direct visual feedback that the ventilations are working and that air is reaching the lungs, which is the crux of its purpose in an emergency situation.