What is the first step in the ACLS algorithm for a patient in cardiac arrest?

The first step in the ACLS algorithm for a patient in cardiac arrest is to verify unresponsiveness and call for help. This action is crucial because it establishes the immediate need for emergency medical assistance and initiates the chain of survival. Recognizing unresponsiveness ensures that the situation is assessed urgently, and alerting others to the emergency facilitates rapid intervention, including activating emergency services and summoning additional personnel who can assist in the resuscitation process.

Following this initial assessment, the healthcare provider can then proceed with appropriate actions such as checking for a pulse, assessing breathing, and administering CPR or defibrillation as necessary. This prioritization reflects a systematic approach to managing cardiac arrest, where prompt identification of an unresponsive patient and mobilization of resources are vital for improving outcomes.