A 70-year-old woman with ongoing severe atrial fibrillation is scheduled for defibrillation. What is an aspect of the rationale and physiology of defibrillation treatment?

Answers:

A. Defibrillation can be achieved using either a transcutaneous or transvenous pacemaker.

B. Interruption of disorganized impulses by the current allows the AV node to readopt its normal pacemaker role.

C. Defibrillation must be coincided with the R wave of the ECG in order to be successful.

D. The goal is to depolarize the entire heart during the passage of current.

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