In the event of cardiac arrest, what is the first action to take?

In the event of cardiac arrest, the first action to take is to start CPR immediately. This is crucial because cardiac arrest results in a cessation of effective blood circulation, meaning vital organs, especially the brain, quickly become deprived of oxygen. Immediate chest compressions are essential to manually circulate blood and provide oxygen to the brain and other vital organs while waiting for emergency medical services to arrive or until an automated external defibrillator (AED) is available.

Starting CPR without delay is a fundamental component of the Chain of Survival in emergency response. It is designed to buy time and sustain the victim until more advanced interventions, like the use of an AED or professional medical help, can be initiated. The rhythm of CPR also helps keep blood flowing, which is critical for improving the outcome for someone in cardiac arrest.

Although notifying emergency services, using an AED, and checking for signs of circulation are important steps, they should follow immediately starting CPR. This initiates an effective response to a life-threatening scenario while further assistance is en route.