患者女性,70岁。住院心电图监测时发生室性心动过速,心率172次/分,血压120/80mmHg,意识清楚,双肺呼吸音清晰,无湿啰音。首选的治疗药物是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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