During a CPR class, a participant asks about the difference between cardioversion and defibrillation. What would be the instructor's best response?
A) "Cardioversion is done on a beating heart; defibrillation is not."
B) "The difference is the timing of the delivery of the electric current."
C) "Defibrillation is synchronized with the electrical activity of the heart, but cardioversion is not."
D) "Cardioversion is always attempted before defibrillation because it has fewer risks."
Ans: B
Feedback:
One major difference between cardioversion and defibrillation is the timing of the delivery of electrical current. In cardioversion, the delivery of the electrical current is synchronized with the patient's electrical events; in defibrillation, the delivery of the current is immediate and unsynchronized. Both can be done on beating heart (i.e., in a dysrhythmia). Cardioversion is not necessarily attempted first.
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