Takahashi H
Department of Obstetrics and Gynecology, Tottori University School of Medicine, Yonago.
Nihon Sanka Fujinka Gakkai Zasshi. 1990 May;42(5):443-9.
Cross correlation coefficients of fetal heart rate (FHR) and fetal movement (FM) signals detected by ultrasonic Doppler actocardiograph were studies. Actocardiographic output was stored in a floppy disk through an AD converter. The parameters for every 5 minute period were calculated in 461 periods for 68 normal pregnant women at 14 to 41 weeks of gestation. 1) Between FHR acceleration (ACC) and the maximum coefficient, the averages for the maximum coefficients in 5 minute periods without and with ACC were 0.141 and 0.275, respectively. The respective lag time averages were 13.1 and 7.6 seconds. These results may indicate that the FHR ACC temporarily follow FM with a time lag of several seconds in the active state. 2) The largest value for the maximum coefficients and the lag times in each examination were investigated according for each gestational week. The coefficients increased and the lag times decreased as gestation advanced. 3) The coefficients in the periods showing typical fetal breathing movement and fetal hiccups were very small. Periodic fetal suckling observed with real-time B mode showed large coefficient with a 3 sec' delay in FM.
对超声多普勒心动描记仪检测到的胎儿心率（FHR）和胎动（FM）信号的互相关系数进行了研究。心动描记图输出通过模数转换器存储在软盘上。对68名妊娠14至41周的正常孕妇在461个时间段内计算了每5分钟时间段的参数。1）在胎儿心率加速（ACC）与最大系数之间，无ACC和有ACC的5分钟时间段内最大系数的平均值分别为0.141和0.275。各自的滞后时间平均值分别为13.1秒和7.6秒。这些结果可能表明，在活跃状态下，胎儿心率加速会在数秒的时间滞后后暂时跟随胎动。2）根据每个孕周研究了每次检查中最大系数和滞后时间的最大值。随着孕周增加，系数增大，滞后时间减小。3）在显示典型胎儿呼吸运动和胎儿打嗝的时间段内系数非常小。实时B超观察到的周期性胎儿吸吮显示系数较大，胎动滞后3秒。
