What is the first step an individual should take if they witness a person in cardiac arrest?

The first step an individual should take upon witnessing someone in cardiac arrest is to call 9-1-1 or the designated emergency number. This action is crucial because it ensures that professional medical help is on the way as soon as possible. Cardiac arrest is a life-threatening emergency where every minute counts, and having emergency services notified can significantly enhance the chances of survival for the affected individual.

Once the call is made, the individual can then focus on providing immediate assistance, such as starting CPR or using an AED if available. Immediate access to professional care is integral to addressing the situation effectively, which is why this step is prioritized over others like checking for a pulse or performing CPR right away. These actions can be critical, but they should follow the notification of emergency services to ensure that comprehensive care arrives without delay.