Mantel R, van Geijn H P, Caron F J, Swartjes J M, van Woerden E E, Jongsma H W
Dept. of Obstetrics and Gynaecology, Academisch Ziekenhuis Vrije Universiteit, Amsterdam, The Netherlands.
Int J Biomed Comput. 1990 May;25(4):261-72. doi: 10.1016/0020-7101(90)90030-x.
A consequent and reproducible determination of baseline is an essential prerequisite for objective interpretation of fetal heart rate. A fully automated off-line method of baseline determination has been developed and tested on 50 normal antepartum fetal heart rate recordings of two hours duration. The method is constructed around two functional units, a digital filter and a trim function, which interact in an iterative process. The results were evaluated in comparison with automated baseline determination according to Dawes and coworkers. A panel of 3 experts agreed that in 14 of the 50 recordings (28%), the new developed procedure resulted in a substantially better baseline fit. In the remaining 34 recordings (72%), baseline fit from both methods was judged as equivalent. The described procedure of baseline determination provides a solid base for automated detection of accelerations and decelerations in fetal heart rate recordings. It enables the study of the relation between the fetal heart rate pattern and fetal movements. Finally, it provides an objective tool for analysis of variables within the fetal heart rate with the highest predictive value with respect to fetal outcome.
对基线进行连贯且可重复的测定是客观解读胎儿心率的必要前提。已开发出一种全自动离线基线测定方法，并在50份时长为两小时的正常产前胎儿心率记录上进行了测试。该方法围绕两个功能单元构建，即数字滤波器和修整函数，它们在一个迭代过程中相互作用。将结果与根据道斯及其同事的方法进行的自动基线测定进行了比较评估。一个由3名专家组成的小组一致认为，在50份记录中的14份（28%）中，新开发的程序产生了明显更好的基线拟合。在其余34份记录（72%）中，两种方法的基线拟合被判定为相当。所描述的基线测定程序为自动检测胎儿心率记录中的加速和减速提供了坚实基础。它使得能够研究胎儿心率模式与胎儿运动之间的关系。最后，它为分析胎儿心率内具有最高胎儿结局预测价值的变量提供了一个客观工具。
