风湿性心脏病人因气急,全身水肿,肝大,颈静脉怒张,服用地高辛半个月后出现室性期前收缩呈二联律,除立即停用洋地黄并补充钾盐外,首选的抗心律失常药是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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