患者女性,50岁,有风湿性心脏病二尖瓣狭窄、心力衰竭,进行强心、利尿、扩血管治疗。用药期间要注意有无洋地黄中毒表现,观察心电图变化,洋地黄中毒引起的心电图改变是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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