男,42岁。间断上腹痛10年,空腹痛明显,伴反酸;半小时前突发腹痛加重,向后背放射,伴大汗。查体:血压80/50mmHg,腹肌紧张呈板状,上腹压痛、反跳痛阳性,肠鸣音低弱,肝浊音界消失,此病人最可能的诊断是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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