无应激试验中胎心减速图形的临床意义

目的分析胎心监护无应激试验（NST）中变异减速及延长减速出现的临床意义。方法回顾性分析产前,NST中出现变异减速或延长减速孕妇200例的监护图形，比较不同类型减速图形出现的临床意义和新生儿结局。结果NST中出现变异减速和延长减速的主要原因有脐带缠绕、羊水过少及胎儿生长受限，重度变异减速及延长减速孕妇胎儿窘迫发生率（17．7％和23．8％）及新生儿重度窒息发生率（4．8％和7．1％）较轻度变异减速（8．3％和1．0％）明显升高。结论NST中变异减速和延长减速的出现受各种因素影响，脐带因素最常见，短暂偶发的轻度变异减速不一定提示胎儿窘迫，重度变异减速及延长减速常提示胎儿宫内状况不良，需加强监护。

The clinical significance of deceleration of rate of fetal heart in non-stress test

Objective To analyse the clinical significance of variable deceleration and extended deceleration in non-stress test. Methods Studied the clinical characteristics of variable deceleration and extended deceleration of 200 cases who underwent non-stress test from January 2005 to December 2007, and compared corresponding clinical significance and newborn prognosis. Results Variable deceleration and extended deceleration in non-stress test dued to cord entanglement, polyhydramnios and. fetal growth restriction. The occurrence of fetal distress and severe asphyxia in newborn were less in low-grade variable deceleration （8.3%, 1.0% ） than those in high-grade variable deceleration （17.7%, 4.8% ）and extended deceleration （23.8 %, 7.1% ）. Conclusion Variable deceleration and extended deceleration in non-stress test due to cord entanglement mostly, low-grade variable deceleration is not always clue to fetal distress and high-grade variable deceleration and extended deceleration is often clue to fetal distress.