Final answer:
If an adult choking victim cannot breathe but is still responsive, abdominal thrusts should be performed to dislodge the blockage. CPR should be initiated if the person becomes unconscious. Consent from the victim is important before helping them.
Step-by-step explanation:
If an adult choking victim cannot breathe but is still responsive, you should perform abdominal thrusts to try and dislodge the blockage. First, get permission from the victim to help them, as consent is important. Stand behind the victim, make a fist with one hand, and place it just above the navel. Cover your fist with your other hand and give quick, upward thrusts. Repeat this until the object causing the choking is expelled or the victim becomes unconscious, at which point you would begin CPR.
Learn more about Choking first aid