DEVELOPMENT OF AUTOMATED FETAL ACTOGRAM ANALYZER FOR FETAL BEHAVIOR STATES

胎儿心动图是由胎儿运动产生的低频超声多普勒信号所形成的具有棘波的胎儿大体运动的记录。胎心率与胎动同步记录。第三个三个月是考试的主要阶段。胎儿活动状态与静息状态有明显的区别，与胎心率加速有关的棘波呈爆发状聚集。潜在的胎儿窘迫很容易通过胎儿运动爆发时加速度的丧失来诊断。心电图机的电输出被引入AD转换器，数据存储在软盘中。用PC98XA型计算机进行数据再现和分析。结果在彩色显示器上显示。胎心率、胎动峰、宫缩、峰瞬时率、爆发期的显示清楚地显示了活跃期和静止期。在激活状态下，幅值较高，SD和CV较大。间期与波幅相同。激活状态的间隔直方图由低电压高发生率和短间隔组成，但数据分布在直方图的较大区域，直到激活状态的高幅度。在休眠状态下，所有参数和区间直方图中的值都很小。呼吸运动直方图表现为幅度较低的峰值，但高于静息状态。经过包络处理后，在激活状态下观察到几个峰，而在休眠状态下没有包络。胎儿呼吸运动在包膜形成后产生平坦但抬高的线条，且水平高于静止状态，对各种状态的识别将是可喜的。这项自动化技术将在胎儿状况分析中发挥重要作用。

Fetal actocardiogram is the record of the fetal gross movement with the spikes which are formed by low frequency ultrasonic Doppler signal that is produced by the fetal movement. The fetal heart rate is recorded simultaneously with the movement. The third trimester is the main period of the examination. Fetal active state is clearly distinguished from the resting state with the burstlike grouping of the spike which is associated with FHR acceleration. Latent fetal distress is easily diagnosed by the loss of acceleration in the presence of fetal movement bursts. Electrical outputs of the actocardiograph was introduced into AD converter and the data were stored in floppy disc. The data were reproduced and analysed by PC98XA computer. Results were displayed on color display. The displays of FHR, fetal movement spikes, contraction, instantaneous rate of the spikes and that of the burst showed the active and resting phases clearly. The amplitude is high, the SD and CV are large in the active state. The interval was the same as the amplitude. Interval histogram of the active state is composed of high incidence at low voltage and short interval, but the data distributed in wide area of the histogram until high amplitude in the active state. The resting state shows very small values in all parameters and interval histograms. The histogram of the breathing movement shows the peaks in low amplitude, but it is higher than that of the resting state. After envelope processing, several peaks are observed in the active state, but no envelope in the resting state. Fetal breathing movement produced flat but elevated line after envelope formation, and the level is higher than the resting state.The results will be promissing in the recognition of every state. The automatic technique will be valuable in the analysis of fetal condition.