Final answer:
When a choking victim is unresponsive, initiate CPR, starting with chest compressions, and use an AED if available, continuing until help arrives or signs of recovery appear.
Step-by-step explanation:
When a choking victim becomes unresponsive, the priority is to provide immediate assistance. After someone has activated the emergency response system, start with cardiopulmonary resuscitation (CPR). First, carefully position the victim on their back and start chest compressions. Place the heel of one hand on the center of the victim’s chest and the other hand on top, keeping your elbows straight, and begin compressions at a depth of at least 5 cm and at a rate of about 100 compressions per minute. Remember the rhythm of the song 'Staying Alive' by the Bee Gees to maintain the correct tempo for chest compressions. Checking occasionally for any obstruction in the throat that can be safely removed is also important, and continue CPR until emergency services arrive or the person starts to show signs of recovery.
If an automated external defibrillator (AED) is available, this may also be used. Many public places have AED units that provide verbal instructions for use. If the person is not breathing normally and no pulse can be felt after completing the initial round of CPR, the AED can be applied to analyze the victim's heart rhythm and, if necessary, deliver an electric shock to attempt to restore a normal heart rhythm.