ACLS Cardiac Arrest Practice Test

What energy level is typically used for the initial defibrillation shock with biphasic devices?

Typically 200 J (range 120-200 J) 120 J 360 J 100 J

Correct Answer:

Typically 200 J (range 120-200 J)

Explanation:

Biphasic defibrillators deliver energy more efficiently, using two current directions, which allows successful defibrillation with lower energy while reducing myocardial injury. Because of this, the typical starting energy for a first shock on modern biphasic devices is around 200 J. The range of 120–200 J accounts for differences between specific devices and manufacturer presets. Higher energies like 360 J were common with older monophasic shocks, whereas 100–120 J would be considered too low for a standard initial biphasic shock. So, 200 J is the best starting point because it balances effectiveness with safety across most devices.

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