Final answer:
The first step of the Cardiac Chain of Survival is early recognition and access to the emergency medical service (EMS) system.
Step-by-step explanation:
The first step of the Cardiac Chain of Survival is early recognition and access to the emergency medical service (EMS) system. In a cardiac emergency, it is important to recognize the signs and symptoms of a heart attack or cardiac arrest and call for emergency help immediately. Time is crucial in saving a person's life, and accessing professional medical care as soon as possible is essential.