When should chest compressions be started in a cardiac arrest scenario?

Chest compressions should be initiated as soon as unresponsiveness is confirmed in a cardiac arrest scenario because immediate action is crucial for increasing the chances of survival. During a cardiac arrest, the heart is not effectively pumping blood, which means that vital organs, including the brain, are not receiving adequate oxygen. Starting compressions immediately helps to circulate any remaining blood in the body, maintaining some level of blood flow to the heart and brain until professional medical help arrives or until an automated external defibrillator (AED) can be used.

In situations of cardiac arrest, every moment counts, and delaying compressions can lead to irreversible damage due to lack of oxygen. This is the rationale behind focusing on chest compressions first, rather than waiting to perform rescue breaths, checking for a pulse, or considering the availability of an AED.