患者男,64岁。偏瘫卧床3年。近日出现小腿疼痛,肿胀,苍白,疑深静脉血栓形成。社区护士指导家属禁止按摩患肢,其目的是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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