患儿,男,7岁,诊断为先天性心脏病并发充血性心力衰竭。患儿拟服用地高辛维持治疗,护士在给患儿服用地高辛前,必须监测( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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