患者,女性,54岁,突然发生昏迷。体检:呼吸困难、脉率快、瞳孔缩小、流涎、呕吐。为尽快明确昏迷原因,首选的辅助检查是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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