What is the maximum time limit for starting CPR after a cardiac arrest?

The correct answer emphasizes the importance of immediate response in the event of a cardiac arrest. Starting CPR as soon as possible—ideally within seconds—significantly increases the chances of survival and reduces the risk of long-term neurological damage. When a person experiences cardiac arrest, the heart stops pumping blood, which leads to a rapid decline in oxygen supply to vital organs.

Immediate initiation of CPR helps maintain blood flow to the brain and other organs until advanced medical help arrives, which can be critical. Performing CPR immediately also helps delay the onset of irreversible damage and increases the likelihood of a successful resuscitation.

This sense of urgency is reflected in many resuscitation guidelines and training protocols, which stress that time is of the essence when dealing with cardiac emergencies. The faster CPR is commenced, the better the outcomes for the patient. In this context, the correct answer aligns perfectly with established emergency medical practices.