Sadovsky E, Ohel G, Simon A
Gynecol Obstet Invest. 1987;23(1):5-9. doi: 10.1159/000298826.
Fetal movements (FM) may be spontaneous, originating in the fetus itself, or evoked by external stimuli. The relative rate of spontaneous and evoked FM has not yet been documented. As it is impossible to differentiate in a singleton pregnancy between these types of movements - the natural model of twin pregnancy was used. The FM of 10 normal twin pregnancies between 33 and 39 weeks of gestation were studied by two realtime ultrasounds, and were operated by two ultrasonographers over a period of 10 min. The mean number of independent FM of each fetus which occurred while the other fetus was resting was 7.9 FM and 7.7 FM, respectively (average 7.8 FM). A mean of 2.5 FM occurred simultaneously. The rate of independent FM was 75.7% and that of simultaneous FM was 24.3%. Vibroacoustic stimulation applied to the maternal abdomen evoked simultaneous movements of both fetuses in all cases. It is suggested that the independent FM may represent spontaneous FM and that the simultaneous FM may indicate the presence of an external stimuli and are therefore evoked responses.
胎动（FM）可能是自发的，源于胎儿自身，也可能由外部刺激诱发。自发胎动和诱发胎动的相对发生率尚未有文献记载。由于在单胎妊娠中无法区分这两种类型的胎动，因此采用了双胎妊娠的自然模型。通过两次实时超声对10例妊娠33至39周的正常双胎妊娠的胎动进行研究，由两名超声检查人员在10分钟内操作。在另一个胎儿休息时，每个胎儿独立胎动的平均次数分别为7.9次和7.7次（平均7.8次）。平均有2.5次胎动同时发生。独立胎动的发生率为75.7%，同时胎动的发生率为24.3%。对孕妇腹部进行振动声学刺激在所有病例中均诱发了两个胎儿的同时胎动。提示独立胎动可能代表自发胎动，而同时胎动可能表明存在外部刺激，因此是诱发反应。
