心律过缓 正常人心跳次数是60～100次/分，小于60就称为心动过缓。心动过缓有几种类型，最常见的是窦性心动过缓。窦性心动过缓可分为病理性及生理性两种。生理性窦性心动过缓是正常现象，一般心率及脉搏在50～60次/分，运动员可能会出现40次的心率，不用治疗，常见于正常人睡眠中、体力活动较多的人。心率或脉搏小于50次多数为病理性，需要治疗，严重者要安装心脏起搏器来加快心率。
其应用于治疗各年龄组心搏停止和心跳过缓已有数十年。
It has been used for decades in all age groups to treat cardiac arrest and bradycardia.
有些婴儿出生时心跳非常缓慢(极端心跳过缓)或出生后他们的心停止了跳动(明显死胎)。
Some babies are born with a very slow heart beat (extreme bradycardia) or their hearts have stopped beating shortly before birth (apparent stillbirth).
然而，回顾没有发现任何试验是针对使用肾上腺素复苏极端心跳过缓新生儿或刚刚停止心脏跳动的婴儿。
However, the review found no trials of the use of epinephrine for reviving newborn babies with extreme bradycardia or whose hearts appear to have just stopped beating.
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