晚期减速是指妊娠期间胎心率的暂时性减慢晚于宫缩高峰。表现为胎盘功能不良、胎儿缺氧。
胎心监护显示晚期减速新生儿窒息率高。
The fetal heart monitor shows that the stifling rate of late-deceleration is higher.
高血压病各组与健康对照组比较，舒张早期与舒张晚期峰值流速的比值（E/A），以及舒张早期流速的减速度（EDC）差异有显著性意义；
The peak flow rate ratio(E/A)in early and late of diastolic phase and the flow rate deceleration in early diastolic phase(EDC)also showed significant differences.
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