({TSE}共用题干)患儿4岁,患室间隔缺损,病情较重,平时需用地高辛维持心功能,现患儿因上感后诱发急性心力衰竭,按医嘱用西地兰,患儿出现恶心,呕吐,视力模糊{TS}上述I临床表现的原因是( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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