Which of the following are differences between cardioversion and ...

[theo]

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

Question 2

Causes of ventricular fibrillation include which of the following? 1. Damage to the sinoatrial node 2. Digitalis overdose 3. Severe hypoxia 4. Myocardial infarction (MI)
 
  a. 2 and 4 only
  b. 1, 2, and 3 only
  c. 2, 3, and 4 only
  d. 1, 3, and 4 only

[jennafosdick]

Answer to Question 1

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.

Answer to Question 2

ANS: C
The most common causes include electrical shock, anesthesia, mechanical irritation of the heart, severe hypoxia, MI, and large doses of digitalis or epinephrine.

[theo]

Excellent

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