What is the best first step when encountering an unresponsive adult victim?

When encountering an unresponsive adult victim, the best first step is to call for emergency medical services. This action is crucial because it initiates the process of obtaining professional medical assistance as quickly as possible. In emergencies, time is of the essence, and having trained professionals en route can significantly improve outcomes for the victim.

After notifying emergency services, other vital actions can follow, such as checking for responsiveness, assessing the victim's breathing and circulation, and beginning rescue breaths or CPR if needed. However, without first ensuring that help is on the way, any further measures may be rendered ineffective if the situation worsens.

Calling for emergency medical assistance provides the necessary support and ensures that additional resources, like ambulance services and advanced medical treatment, are mobilized promptly. Thus, this step is foundational and establishes the framework for subsequent emergency care actions.