Why is early defibrillation a critical component of CPR?

Early defibrillation is critical in CPR primarily because it can eliminate an abnormal heart rhythm, specifically life-threatening arrhythmias such as ventricular fibrillation or pulseless ventricular tachycardia. These arrhythmias prevent the heart from effectively pumping blood to the brain and other vital organs, leading to rapid deterioration and increased risk of death. When defibrillation is administered quickly, it can reset the heart’s electrical activity, allowing it to resume a normal rhythm and restore effective circulation.

This prompt restoration of a normal heart rhythm significantly increases the chances of survival and minimizes the risks associated with prolonged cardiac arrest, such as brain injury due to lack of oxygen. While maximizing blood circulation, preventing brain damage, and decreasing rescue time are all important aspects of CPR and emergency response, the ability of defibrillation to promptly correct the underlying electrical disturbances of the heart is what makes it a critical element in the chain of survival.