男,64岁,散步时突然自觉腹部不适,恶心,头晕,出虚汗,心率加快,心慌,急就诊,查体:P118次/分;BP100/60mmHg;心率整,面色苍白,腹部广泛压痛,尤以右侧腹明显,轻度肌紧张,既往有肝炎后肝硬化史,但无出血史,亦未做进一步检查。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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