Solum T, Ingemarsson I, Nygren A
J Perinat Med. 1980;8(3):142-9. doi: 10.1515/jpme.1980.8.3.142.
The aim of this study was to investigate the quality of the abdominal fetal electrocardiography (aFECG), and compare the short term and long term variability registered by this method with the direct fetal electrocardiography (dFECG). With three cardiotocographs the aFECG, the dFECG and the maternal ECG were registered simultaneously and stored on a magnetic tape. After analogue-digital conversion, the information was calculated in a computer system. The variability registered by aFECG and dFECG was compared allowing a difference of both one beat and two beats/min. From nine patients in early labour 30651 heart beats were registered by dFECG. By aFECg 27720 beats were registered. Within a window of +/- 10 ms 98.5% of all pulses registered by aFECG were found. The correlation coefficients for short term variability were 0.75 and 0.91. For long term variability the correlation coefficients were 0.94 and 0.98. To allow calculations of the short term variability the registration of the instantaneous fetal heart rate is necessary. In the antenatal period only indirect methods for electrocardiography are possible. The present report shows that with the abdominal electrocardiography the short term and long term variability can be judged. the quality of the registrations is good enough to allow computer calculations of the information.
本研究的目的是调查腹部胎儿心电图（aFECG）的质量，并将该方法记录的短期和长期变异性与直接胎儿心电图（dFECG）进行比较。使用三台胎心监护仪同时记录aFECG、dFECG和母体心电图，并存储在磁带上。经过模拟-数字转换后，在计算机系统中对信息进行计算。比较aFECG和dFECG记录的变异性，允许每分钟相差1次和2次心跳。在9例早产患者中，dFECG记录到30651次心跳。aFECG记录到27720次心跳。在±10毫秒的窗口内，发现aFECG记录的所有脉冲中有98.5%。短期变异性的相关系数分别为0.75和0.91。长期变异性的相关系数分别为0.94和0.98。为了计算短期变异性，需要记录瞬时胎儿心率。在产前阶段，只能采用间接心电图方法。本报告表明，通过腹部心电图可以判断短期和长期变异性。记录质量足够好，能够对信息进行计算机计算。
