患者,女性,40岁。下肢静脉曲张。行下肢静脉瓣膜功能试验,先平卧,抬高患肢,待曲张静脉淤血排空后,在大腿根部扎止血带。患者站立后,30s内曲张静脉迅速充盈,从该结果显示( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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