If you are alone and witness a cardiac arrest, what is the first action you should take?

Starting CPR immediately is the most critical first action to take if you are alone and witness a cardiac arrest. Cardiac arrest occurs when the heart suddenly stops beating, leading to a loss of blood flow to the brain and other vital organs. When no pulse is detected and the person is unresponsive, initiating CPR as quickly as possible increases the chances of survival and improves the likelihood of a favorable outcome.

In a situation of cardiac arrest, every second counts. High-quality CPR helps maintain blood flow to vital organs and can buy time until professional medical help arrives. It is essential to begin chest compressions without delay because the longer a person goes without oxygen, the greater the risk of brain damage or death.

While calling for help or checking for a pulse are important steps in emergency response, they should not take precedence over immediate CPR in witnessed cardiac arrest cases. Administering first aid is also less relevant in this context, as the priority is restoring circulation. Thus, starting CPR is the most effective immediate response to maximize the chance of survival.