患者,男,60岁,近半年来自觉心前区阵发性疼痛,常在休息或清晨时发作,持续时间15分钟,含服硝酸甘油后缓解,疼痛发作时,心电图胸前导联ST段抬高,运动负荷试验阴性。其诊断为
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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