Solum T, Ingemarsson I, Nygren A
J Perinat Med. 1981;9(1):54-62. doi: 10.1515/jpme.1981.9.1.54.
The present work investigated the accuracy of ultrasound cardiography (uFCG) in registering the fetal heart rate variability. Five patients in early labour were studied. Two cardiotocographs (HP 8030A) were simultaneously recording uFCG and direct fetal electrocardiography (dFECG). The information was stored in an analogue FM tape recorder for further data processing. The number of beats registered by the two methods were counted, and the time intervals between the beats were calculated. The short term variability (STV) and the long term variability (LTV) were investigated according to the definitions of DE HAAN [3]. To get an acceptable correlation coefficient in STV of 0.78, a difference as high as 5 beats per minute (bpm) between the two registrations had to be allowed. For LTV, a correlation coefficient of 0.70 was reached at a difference of 2 bpm. The results of the study show that the uFCG can hardly be used in interpretation of the STV. As the visual examination of the cardiotocograms reflects the LTV rather than the STV [7, 9], the uFCG can be used for interpretation of LTV provided that "jitter" is absent on the tracing.
本研究调查了超声心动图（uFCG）记录胎儿心率变异性的准确性。对5例早产患者进行了研究。两台胎心监护仪（惠普8030A）同时记录uFCG和直接胎儿心电图（dFECG）。信息存储在模拟调频磁带录音机中以便进一步数据处理。计算两种方法记录的心跳次数，并计算心跳之间的时间间隔。根据德哈恩[3]的定义研究短期变异性（STV）和长期变异性（LTV）。为了在STV中获得0.78的可接受相关系数，必须允许两次记录之间每分钟有高达5次心跳（bpm）的差异。对于LTV，在差异为2 bpm时达到了0.70的相关系数。研究结果表明，uFCG几乎不能用于解释STV。由于胎心监护图的视觉检查反映的是LTV而不是STV[7,9]，如果描记图上没有“抖动”，uFCG可用于解释LTV。
