分娩时脐动脉血气分析的临床意义

目的了解分娩时脐动脉血气的临床意义。方法选取2005年3月至2006年12月在北京大学第一医院分娩的产妇810例,临床诊断胎儿窘迫401例,无胎儿窘迫409例,在胎儿娩出后立即行脐动脉血气分析,并追踪新生儿结局,进行分析。结果①胎儿窘迫组中脐血pH值〈7.2者49例,占12.2%,而无胎儿窘迫组pH值〈7.2者26例,占6.4%。二者间差异有统计学意义（P=0.004）;胎儿窘迫组脐血pH均值（7.25±0.24）,无胎儿窘迫组脐血pH均值（7.28±0.05）,两组差异有统计学意义（P=0.023）;②新生儿出生后1min Apgar评分〉7分者中脐血pH值〈7.2占8.3%,而Apgar评分≤7分者中高达34.5%,二者差异有统计学意义（P=0.000）;③本研究中新生儿缺氧缺血性脑病（HIE）共18例,Apgar评分≤7分对HIE诊断的敏感性为38.9%,特异性为97.2%,阳性预测值24.1%,阴性预测值98.6%;脐血pH值〈7.2对HIE诊断的敏感性55.6%,特异性91.8%,阳性预测值13.3%,阴性预测值98.9%;Apgar评分≤7分和pH值〈7.2联合预测HIE的发生,特异性能增加至99.4%,阳性预测值增加至50%,阴性预测值98.4%。结论临床诊断胎儿窘迫者大多数出生时脐血气正常,可能存在过度诊断和治疗现象;血气分析是Apgar评分的补充,二者结合能增加对HIE诊断的特异性和阳性预测值,应结合Apgar评分和脐动脉血气分析来共同评价新生儿预后。

Clinical significance of umbilical cord artery blood gas analysis in labor

Objective To evaluate the clinical significance of umbilical cord artery blood gas analysis in labor.Methods Retrospective study of 810 pregnancy women delivered at Department of Obstetrics and Gynecology,Peking University First Hospital,between March,2005 and December,2006 was performed.There were 401 women who had fetal distress(distress group)and 409 women who had no fetal distress(non-distress group).Umbilical cord artery blood gas analysis was performed immediately after delivery and the outcome of neo...