When should a rescuer consider using a bag-valve-mask?

Using a bag-valve-mask (BVM) is appropriate when a victim requires ventilation assistance, which typically occurs when they are unable to breathe effectively on their own or are not ventilating adequately due to respiratory failure or cardiac arrest. The BVM allows the rescuer to provide positive pressure ventilation, delivering oxygen directly into the victim's lungs. This is vital in scenarios where the airway is compromised or when the victim is unresponsive and does not exhibit normal breathing.

In situations where the victim is conscious and breathing adequately, additional ventilation support from a bag-valve-mask would not be necessary. Similarly, the use of a BVM does not pertain to scenarios regarding the availability of an AED or whether CPR is being performed, as those factors are not directly related to the immediate need for assisted ventilation. The key consideration for utilizing a BVM is the need for effective oxygen delivery when the individual is unable to breathe or maintain adequate oxygenation independently.