Which of the following are differences between cardioversion and defibrillation?
1. In cardioversion, the countershock is synchronized with the R wave.
2. In defibrillation, more energy is applied.
3. In cardioversion, the countershock is synchronized with the R wave.
4. In defibrillation, more energy is applied.
a. 1 only
b. 1 and 2 only
c. 2 only
d. 3 and 4 only
ANS: B
Cardioversion is similar to defibrillation, with two major exceptions. First, the countershock is synchronized with the heart's electrical activity (the R wave). Synchronization is necessary be-cause electrical stimulation during the refractory phase (part of the T wave) can cause ventricular fibrillation or tachycardia. Second, the energy used during cardioversion usually is less than that applied during defibrillation.
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