患者,女性,40岁,因肠梗阻入院。采用非手术治疗期间,护士发现腹部出现固定性压痛及腹膜刺激征,提示肠梗阻的性质演变为( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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