This step is commonly known as the most important link within the Chain of Survival, because, generally, treatment with an automatic external defibrillator(AED) will restore a normal beat to a heart quivering from SCA by delivering a measured electric shock.
Timing is vital. According to the American Heart Association, reducing the interval between cardiac arrest and delivery of a shock by even a couple of seconds will increase an individual's chance of survival. for each minute that passes prior to defibrillation, the probabilities for survival reduce 7-10%. After ten minutes, survival is unlikely.
CPR alone cannot totally resuscitate an individual in SCA. Most SCA victims are in a ventricular fibrillation arrhythmia (VF), an electrical malfunction of the heart that causes it to twitch without coordinated beats. Defibrillation, the delivery of a shock to the heart, will restore traditional heart operation if it happens within minutes of SCA onset.
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