A nurse must deliver a shock to a client in ventricular fibrillation by using a biphasic defibrillator. Which describes the amount of energy delivered with the first shock on an adult client?
a. 150 joules
b. 120 joules
c. 200 joules
d. 360 joules
b. 120 joules
rationale: "120 joules" is correct. When setting the energy level on a defibrillator for an adult client who is in ventricular fibrillation, the initial level with a biphasic defibrillator is 120 joules. The sequence is as follows. Biphasic: 120 - 150 - 200 - 200. Monophasic - start at 200 - 260 joules. Clients tend to have better outcomes when a biphasic defibrillator is used compared to a monophasic defibrillator.
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