Arima T
Acta Obstet Gynaecol Jpn. 1981 Feb;33(2):269-77.
Fetal heart beat intervals are statistically studied with the use of direct fetal ECG signal, universal counter module, HP 2100 A computer and fetal heart rate meter. In 78 cases of labor, 260 data trains which are composed of 250 beat intervals respectively are utilized for the study. Fetal heart rate curves are classified into Hammacher's 4 oscillation types. Every beat interval (BI), beat interval difference (ID) are studied with the comparison to interval index (II) and differential index (DI) of Yeh, and long term irregularity index (LTI) and short term irregularity index (STI) of de Haan. Among 4 oscillation types, ID value is the least in type 0, the next in type 1 then 2, and the largest in type 3. The differences are significant respectively. Percentages of ID below 1 ms histogram showed the largest value in type 0, the next in type 1 then 2, and the least in type 3. The differences are significant respectively. Normal type 2 and abnormal type 0 cases are compared by STI, DI and ID. Mean value of STI shows no difference between the cases, but the SD is very small in type 0. DI is small in type 0, and mean and SD of ID of the author are small in type 0. The utility of ID is suspected from the results in this study.¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿
利用直接胎儿心电图信号、通用计数器模块、惠普2100 A计算机和胎儿心率计对胎儿心跳间期进行统计学研究。在78例分娩病例中，使用了分别由250个心跳间期组成的260组数据序列进行研究。胎儿心率曲线被分为哈马赫尔的4种振荡类型。将每个心跳间期（BI）、心跳间期差值（ID）与叶的间期指数（II）和微分指数（DI）以及德哈恩的长期不规则指数（LTI）和短期不规则指数（STI）进行比较研究。在4种振荡类型中，ID值在0型中最小，其次是1型，然后是2型，在3型中最大。差异均具有统计学意义。ID低于1毫秒的直方图百分比在0型中最大，其次是1型，然后是2型，在3型中最小。差异均具有统计学意义。通过STI、DI和ID对正常2型和异常0型病例进行比较。STI的平均值在病例之间无差异，但0型的标准差非常小。0型的DI较小，作者所测ID的平均值和标准差在0型中也较小。从本研究结果来看，ID的实用性受到质疑。
