Bioelectrical fetal heart activity being recorded from maternal abdominal surface contains more information than mechanical heart activity measurement based on the Doppler ultrasound signals. However, it requires extraction of fetal electrocardiogram from abdominal signals where the maternal electrocardiogram is dominant. The simplest technique for maternal component suppression is a blanking procedure, which relies upon the replacement of maternal QRS complexes by isoline values. Although, in case of coincidence of fetal and maternal QRS complexes, it causes a loss of information on fetal heart activity. Its influence on determination of fetal heart rate and the variability analysis depends on the sensitivity of the heart-beat detector used. The sensitivity is defined as an ability to detect the incomplete fetal QRS complex. The aim of this work was to evaluate the influence of the maternal electrocardiogram suppression method used on the reliability of FHR signal being calculated.

译文

:从产妇腹部表面记录的生物电胎儿心脏活动比基于多普勒超声信号的机械心脏活动测量所包含的信息更多。但是,这需要从以孕妇心电图为主的腹部信号中提取胎儿心电图。抑制母体成分的最简单技术是消隐程序,该程序依赖于用等值线值替代母体QRS络合物。尽管在胎儿和母亲QRS复合体重合的情况下,它会导致胎儿心脏活动信息丢失。它对胎儿心率测定和变异性分析的影响取决于所用心跳检测器的灵敏度。灵敏度定义为检测不完整胎儿QRS复合体的能力。这项工作的目的是评估所使用的产妇心电图抑制方法对正在计算的FHR信号的可靠性的影响。

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