However, there is a subtle difference in the exact definitions of these terms. An automatic defibrillator could be described as a defibrillator that is fully automatic. In other words, a fully automatic AED would determine whether a shock should be delivered and would then automatically deliver the electric impulse without intervention by the operator or responder. No fully automatic defibrillators are currently being manufactured, and very few actually exist . The term automatic is often used to mean an automated defibrillator .
Many people consider the use of the term automatic acceptable.
However, for the sake of accuracy and consistency, the term automated is preferable. Semiautomatic has the same meaning as automated. It is more common to hear an AED described as automated rather than semiautomatic. A semiautomatic or automated AED determines whether or not a shock should be delivered but prompts the operator to press a button that actually delivers the shock. Again, for the sake of consistency, AEDs should be referred to as automated external defibrillators .