男性,33岁,因"原发甲亢"施行甲状腺次全切除术后6小时,患者感呼吸困难。面色青紫,颈部敷料呈红色。下列并发症中,哪项可能性大()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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