男,56岁,充血性心力衰竭,心率长期维持在100~110次/分,口服地高辛0.25mg1次/日,治疗2周后心率无明显下降为了控制心率应首先的措施是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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