In what scenario is it crucial to call 911 before beginning CPR?

Calling 911 before beginning CPR is crucial in cases of cardiac arrest, especially when the patient is unresponsive, because immediate access to emergency medical services (EMS) can significantly increase the chances of survival. Cardiac arrest is a life-threatening situation where the heart stops beating effectively, leading to a cessation of blood flow to vital organs, including the brain.

Initiating CPR helps to maintain vital blood circulation and oxygenation until professional help arrives, but calling 911 first ensures that advanced medical care is on the way. This call alerts emergency responders to the situation, which helps them prepare to provide further life-saving interventions upon arrival. In such an emergency, every minute counts, and having professional equipment and medication available can make a critical difference in the outcomes for the patient.