患者,男性,8h前剧烈咳嗽时,右侧腹股沟斜疝被嵌顿。护士如果观察到下列哪项说明疝发生绞窄,应做好急诊手术前准备( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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