Why is it important to call 911 before starting CPR?

Calling 911 before starting CPR is crucial because it ensures that professional help is on the way. While initiating CPR is vital in a cardiac emergency, the effectiveness of resuscitation increases significantly when advanced medical assistance is also en route. Emergency medical professionals can provide advanced life support and intervention that are beyond the scope of CPR, which can improve the victim's chances of survival and recovery.

In addition to starting CPR immediately, notifying emergency services ensures that when you complete the CPR or if an Automated External Defibrillator (AED) becomes available, trained professionals will be ready to take over care as soon as they arrive. This continuity of care is critical in medical emergencies.

Securing help in advance also alleviates any need for the rescuer to stop performing CPR to call for help later, thereby maintaining the best possible chance of survival for the individual experiencing a cardiac arrest.