摘要：ST段是自QRS波群的终点至T波起点间的时段，相当于动作电位2相平台期，代表心室缓慢复极过程。正常ST段多为一等电位线，有时也有轻微的偏移，但ST段抬高在V1-V3导联不超过0．2mV，V4-V6及肢体导联不超过0．1mV；ST段下移不超过0．05mV；时限0．05—0．12s。
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