What should be done if a person is unresponsive and not breathing?

When a person is unresponsive and not breathing, the most critical action is to begin CPR immediately. This response is essential because it helps maintain blood circulation and oxygen delivery to vital organs, particularly the brain and heart. In such emergencies, the brain can start to incur damage within minutes due to lack of oxygen, making timely intervention crucial.

Starting CPR as soon as possible activates the chain of survival, which significantly increases the chances of resuscitation and recovery. During CPR, chest compressions can assist in circulating the remaining blood throughout the body, while rescue breaths can provide oxygen when performed appropriately.

In contrast, checking for a pulse, while important in some contexts, can waste precious time when action is required. Similarly, waiting for help to arrive can be detrimental, as immediate help can make the difference between life and death. Abdominal thrusts, designed to relieve choking, would not be appropriate in this scenario since the person is unresponsive and not breathing, indicating a need for CPR rather than airway clearance measures. Therefore, initiating CPR is the most effective and lifesaving response in this situation.