Hoppenbrouwers T, Combs D, Ugartechea J C, Hodgman J, Sterman M B, Harper R M
Obstet Gynecol. 1981 Mar;57(3):301-9.
This study was designed to provide normative data on fetal heart rate (FHR), FHR variability, accelerations, and decelerations during maternal sleep in the third trimester of pregnancy and to identify rhythmicity in FHR variability. Twenty-four polygraphic recordings were obtained in 16 pregnant women at 32 and 36 weeks' gestation. FHR parameters were not predictably influenced by maternal sleep states. Cyclic changes in FHR variability with median cycle length of 53 minutes were observed. Accelerations and decelerations occurred an average of 12.2 and 4 times per 100 minutes, respectively. Bradycardia and tachycardia persisting beyond 10 minutes were not seen. FHR variability ranged from marked to decreased within recordings of the same subject; this observation has implications for non-stress testing of the fetus.
本研究旨在提供妊娠晚期孕妇睡眠期间胎儿心率（FHR）、FHR变异性、加速和减速的规范数据，并确定FHR变异性中的节律性。在16名孕妇妊娠32周和36周时获得了24份多导记录。FHR参数不受孕妇睡眠状态的可预测影响。观察到FHR变异性的周期性变化，中位周期长度为53分钟。加速和减速分别平均每100分钟发生12.2次和4次。未观察到持续超过10分钟的心动过缓和心动过速。在同一受试者的记录中，FHR变异性范围从明显到降低；这一观察结果对胎儿的无应激试验具有重要意义。
