A 78-year-old woman admitted to the ICU for chest trauma develops a supraventricular arrhythmia(室上性心律失常) with rapid ventricular response. Her blood pressure is 80/50 mm Hg, so the decision is made to perform synchronized（同步） cardioversion with 200 joules. Before synchronized cardioversion, she becomes unresponsive and pulseless as the rhythm changes to that shown in the figure below. The shock button on the defibrillator is pressed but it fails to deliver a shock.
Which of the following is the most likely reason for this failure?
A. The defibrillator battery failed.
B. The device is unable to sync.
C. Ventricular fibrillation cannot be shocked in sync mode.
D. A lead has lost contact, causing the irregular rhythm.
答案解析：
该患者患有室上性心律失常伴血流动力学不稳定，因此决定心脏同步电复律，并将除颤器置于同步模式。然而，该节律演变为室颤，当同步按钮保持开启时，室颤不会受到电击。
正确答案：C
补充内容：
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