单选题急性心肌梗死50%～81%有先兆症状，表现为（）A新发生心绞痛或原有心绞痛加重B不稳定型心绞痛C劳累型心绞痛D变异型心绞痛E急性冠脉综合征
单选题
急性心肌梗死50%～81%有先兆症状，表现为（）
A
新发生心绞痛或原有心绞痛加重
B
不稳定型心绞痛
C
劳累型心绞痛
D
变异型心绞痛
E
急性冠脉综合征
参考解析
解析：
先兆症状约有50%～81%，2%的患者在起病前数日有乏力、胸部不适、活动时心悸、气急、烦躁、心绞痛等前驱症状。特别是新发生心绞痛及原有心绞痛加重较为突出。
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