患儿,5岁,患动脉导管未闭,病情较重,平时需用地高辛维持心功能。现患儿因上呼吸道感染后诱发急性心力衰竭,护士按医嘱给患儿应用毛花苷C(西地兰)后,患儿出现头晕、呕吐、视物模糊,该护士考虑发生这些表现的原因是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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