患者,女性,70岁,不慎摔倒致右股骨转子骨折,伴移位。因心功能不全不宜手术治疗,采用骨牵引。应重点预防的并发症是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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