In what scenario might the back pressure arm lift method be appropriate?

The back pressure arm lift method is appropriate in scenarios where the casualty has a mouth injury or in a contaminated area because this method allows the rescuer to provide ventilation without directly inserting their mouth to the casualty's mouth. This helps to avoid the risk of further injury or contamination, ensuring the safety of both the rescuer and the casualty. In situations where a mouth injury might complicate traditional mouth-to-mouth resuscitation techniques, this method provides an alternative that can still facilitate effective breathing support.

In contrast, the other scenarios listed do not identify conditions where the back pressure arm lift would be necessary or beneficial. Performing CPR on a child typically requires different techniques that are more suited to their size and airway management. A fatigued rescuer may need to consider safety and backup support rather than relying on a specific technique like the back pressure arm lift, and routine medical checks usually do not require such emergency methods, as they involve assessment rather than immediate resuscitative actions.