患者,男,28岁。周期性中上腹痛5年余,多于饥饿时痛,时有夜间痛醒,进食后缓解,常有反酸、嗳气。近2天大便呈柏油状,伴头昏、乏力就诊。体检:血压12/8kPa;心率104次/分钟, 腹软,上腹部轻度压痛,肝脾肋下未扪及,肠鸣音活跃,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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