简述心绞痛的临床特点。
疼痛多在心前区与胸骨后或剑突下,常放射至左肩、左臂内侧、达无名指与小指,亦可放射至左颈部与面颊部,呈绞窄性并有重压窒息感,发作时间短暂,常在劳累、体力活动、精神紧张时诱发,休息、含服硝酸甘油或硝酸异山酯可缓解。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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