An adult is suffering a cardiac arrest. What should be your first action to restore circulation?

In a scenario of cardiac arrest, the immediate priority is to restore circulation to ensure that vital organs receive oxygenated blood as quickly as possible. Starting chest compressions is crucial because they provide a mechanical means of pumping blood through the heart and into the body's vital organs.

Compressions should be initiated without delay, as they significantly increase the chances of survival, particularly when combined with effective rescue breaths and prompt defibrillation if indicated. While other actions, such as calling for advanced medical support or checking for a pulse, are important components of a comprehensive response, they can delay life-saving measures. In the absence of a pulse, initiating compressions immediately supersedes these steps. Therefore, beginning chest compressions right away is the most effective action to restore circulation in an adult experiencing cardiac arrest.