What initial action should be taken during a cardiac arrest situation in the ambulance?

In the context of a cardiac arrest situation, the priority is to act swiftly to increase the chances of survival for the patient. Initiating cardiopulmonary resuscitation (CPR) is critical because it helps maintain blood flow to vital organs until advanced medical interventions can be provided. By calling for help and starting CPR immediately, responders create a crucial window of support that can preserve brain function and other vital organs.

In a cardiac arrest, the effectiveness of early CPR directly correlates with survival rates. The quicker CPR is initiated, the better the outcomes for the patient. It is important to focus on this critical action rather than engaging in detailed assessments or other interventions that would delay immediate care. The other options, which involve reviewing medical history, applying a splint, or ensuring transportation has occurred, do not address the urgent need for immediate life-saving measures in the event of cardiac arrest.