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目的研究胎儿血氧饱和度(FSO2)预测胎儿酸中毒的阈值及准确性。方法200212-200406对广东省人民医院及青海红十字会医院的226例产妇在宫口开大3cm以上者行FSO2监测及电子胎儿监护仪监护,应用受试者工作特征曲线评估FSO2阈值;研究将30%作为FSO2阈值,评估其预测胎儿酸中毒的准确性。结果第二产程FSO2较第一产程下降,二者均值差异有显著性;脐动脉血气与FSO2呈相关性;将30%作为FSO2阈值,预测胎儿宫内缺氧的敏感性、特异性、阳性预测值、阴性预测值及准确性分别为88.9%、96.8%、84.2%、97.6%、95.6%。结论将30%作为FSO2的阈值是适宜的;FSO2可提高诊断胎儿宫内酸中毒的准确性。
Objective To study the threshold and accuracy of fetal blood oxygen saturation (FSO2) in predicting fetal acidosis. Methods A total of 226 maternal women in Guangdong Provincial People ’s Hospital and Qinghai Red Cross Hospital were enrolled in this study. FSO2 monitoring and electronic fetal monitor monitoring were performed at a distance of 3cm and above in the cervix. The FSO2 threshold was evaluated using the receiver operating characteristic curve. 30% as FSO2 threshold to assess its accuracy in predicting fetal acidosis. Results The FSO2 of the second stage of labor was lower than that of the first stage of labor, the difference between the two groups was significant. The correlation between umbilical arterial blood gas and FSO2 was correlated. Thirty percent of the FSO2 was taken as the threshold of FSO2 to predict the sensitivity, specificity and positive predictive value of fetal hypoxia The values, negative predictive value and accuracy were 88.9%, 96.8%, 84.2%, 97.6%, 95.6% respectively. Conclusion It is appropriate to use 30% as the threshold for FSO2; FSO2 may improve the diagnostic accuracy of intrauterine acidosis.