If a responsive choking person becomes unresponsive, what is the appropriate action to take?

When a responsive choking person becomes unresponsive, the immediate and appropriate action is to begin CPR and check for an obstructing object in the airway. If the person is unresponsive, they will not be able to cough or breathe, indicating a complete obstruction. Starting CPR is crucial as it helps to restore circulation and can clear the airway if performed correctly.

During the CPR process, you would also check for an object in the mouth, as this can be a lifesaving step, helping to dislodge anything blocking the airway. Continuous chest compressions can generate enough pressure to sometimes expel the blockage, and rescue breaths can also assist in getting air into the lungs if there's no obstruction discovered.

In contrast, performing abdominal thrusts is only appropriate for a responsive individual and could cause harm if the person is already unresponsive. Back blows would also not be effective once the person is unresponsive, as they are intended for a person who is still conscious and capable of responding. Calling emergency services, while important, should be integrated into the response after ensuring the unresponsive individual is receiving CPR, as this is the most immediate action to try to save their life.