患者,男,50岁。饱餐后2小时感上腹部疼痛,渐加剧,呕吐2次,2小时后来诊。既往无腹痛病史。检查:血压170/100mmHg,体温38℃,上腹部压痛,反跳痛。血淀粉酶250U/L, 尿淀粉酶32U/L。输液6小时后症状不缓解。最有助于诊断的检查是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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