男性,52岁,原有劳累型心绞痛,近2周来每于清晨5时发作,疼痛持续时间较长入院,住院期间发作时心率50次/分,早搏4~5次/分,血压95/60mmHg,心电图Ⅱ、Ⅲ、aVFST段抬高,加用硝苯地平后未再发作,应用硝苯地平机制是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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