男,60岁,肥胖。行右股骨外科颈骨折开放复位术,硬膜外麻醉效果不佳改全身麻醉,因声门显露困难反复试插管期间,患者出现室颤。静脉快速诱导后患者突然出现室颤下列哪项不属于脑死亡的征象()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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