Abboud S, Barkai G, Mashiach S, Sadeh D
Biomedical Engineering Program, Faculty of Engineering, Tel Aviv University, Israel.
Comput Biol Med. 1990;20(3):147-55. doi: 10.1016/0010-4825(90)90001-6.
A signal analysis procedure is described for obtaining time intervals parameters of the fetal electrocardiogram as recorded from the maternal abdomen. Applying averaging to the fetal electrocardiogram quantification of the PR interval, QRS duration and QT interval were measured. This technique which includes the subtraction of an averaged maternal ECG waveform using cross-correlation function and fast Fourier transform algorithm, enables the detection of all the fetal QRS complexes in spite of their coincidence with the maternal ECGs. Results that were obtained from 21 pregnant women at the gestational age of 32-41 weeks and an example of a recording with fetal premature ventricular contractions are presented. This method shows an important improvement with respect to detection of fetal heart rate and detection of arrhythmia disturbances in the fetal ECG. The averaging procedure can be used to evaluate long-lived alterations in the fetal ECG.
本文描述了一种信号分析程序，用于从孕妇腹部记录的胎儿心电图中获取时间间隔参数。通过对胎儿心电图进行平均处理，测量PR间期、QRS波群时限和QT间期。该技术包括使用互相关函数和快速傅里叶变换算法减去平均后的母体心电图波形，即使胎儿QRS波群与母体心电图重合，也能检测到所有胎儿QRS波群。给出了21名孕周在32至41周的孕妇的结果，以及一份伴有胎儿室性早搏的记录示例。该方法在检测胎儿心率和胎儿心电图心律失常方面有重要改进。平均处理程序可用于评估胎儿心电图的长期变化。
