Suidan J S, Young B K, Hochberg H M, George M E
J Reprod Med. 1985 Jul;30(7):519-22.
Fifty-three fetal heart rate (FHR) tracings obtained by direct ECG monitoring during labor and 24 simultaneous external Doppler FHR tracings were analyzed for the quantitative assessment of baseline FHR variability. The beat-to-beat difference in FHR subsumed by 90% of all beat-to-beat changes within a tracing was taken as the index of variability of that tracing. This index correlated well with the visual assessment of variability for both internal ECG records (Spearman rank correlation coefficient, rs, = 0.71) and external Doppler records (rs = 0.78). However, there was no correlation between the variability index of the Doppler FHR records and that of simultaneous ECG FHR records (r = 0.11, p greater than 0.6). This finding casts doubt on the use of the presence of "normal" FHR variability as a sign of fetal well-being during antepartum FHR monitoring with current Doppler equipment.
对分娩期间通过直接心电图监测获得的53份胎儿心率（FHR）描记图以及24份同时进行的外部多普勒FHR描记图进行分析，以定量评估FHR基线变异性。将描记图中90%的逐搏变化所包含的FHR逐搏差异作为该描记图变异性的指标。该指标与内部心电图记录（Spearman等级相关系数，rs = 0.71）和外部多普勒记录（rs = 0.78）的变异性视觉评估相关性良好。然而，多普勒FHR记录的变异性指标与同时的心电图FHR记录的变异性指标之间无相关性（r = 0.11，p大于0.6）。这一发现使人对在产前FHR监测中使用当前多普勒设备时将“正常”FHR变异性的存在作为胎儿健康的标志产生怀疑。
