患者,女性,45岁,2个月来周期性发作上腹痛,疼痛多在空腹及夜间出现,进食后可缓解,3d来解柏油样便,患者面色苍白,四肢湿冷,血压80/50mmHg,脉搏120/min,应诊断为( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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