患者,男,58岁,黑便3天,呕血1天伴头晕、心悸被送入急诊室。既往有“慢性胃病史”无肝病史。查体:T36.6℃,96次/分,BP108/70mmHg,意识清楚,面色苍白,巩膜无黄染,心肺检查未见异常,腹软,未见腹壁静脉曲张,肝脾肋下未触及,移动性浊音阴性,肠鸣音活跃。化验:Hb85g/L,WBC4.0×10⁹/L,PLT122×10⁹/L。此时最重要的处理原则是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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