患者,男,42岁,毕Ⅱ式胃大部切除术后两年,上腹部有烧灼痛,抗酸剂治疗无效,有时呕吐,含胆汁,吐后腹痛无缓解,体重减轻,胃镜下黏膜充血、水肿、易出血。最可能的诊断是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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