Divon M Y, Muskat Y, Platt L D, Paldi E
Am J Obstet Gynecol. 1984 Aug 15;149(8):893-6. doi: 10.1016/0002-9378(84)90611-2.
A computerized system was used during labor to provide a quantitative and objective analysis of fetal heart rate, beat-to-beat variability, and uterine contractions. Twenty-nine healthy pregnant women at term participated in this study. Each woman was studied for a 40-minute period during the active phase of spontaneous labor. The results indicate that beat-to-beat variability rises from a value of 4.62 +/- 1.11 (mean +/- SD) between contractions to 6.86 +/- 1.53 during contractions. This rise is significant (p less than 0.01). At the same time, changes in fetal heart rate are small, inconsistent, and not significant. We conclude that an increased beat-to-beat variability is commonly associated with uterine contractions in normal fetuses. This increase is probably due to mild hypoxia caused by decreased perfusion of the placenta and to increased vagal tone caused by fetal head compression.
在分娩过程中使用了一个计算机系统，以对胎儿心率、逐搏变异性和子宫收缩进行定量和客观分析。29名足月健康孕妇参与了这项研究。每位孕妇在自然分娩的活跃期接受了40分钟的研究。结果表明，逐搏变异性从宫缩间歇期的4.62±1.11（平均值±标准差）升至宫缩期的6.86±1.53。这种升高具有显著性（p<0.01）。同时，胎儿心率变化较小、不一致且无显著性。我们得出结论，正常胎儿的逐搏变异性增加通常与子宫收缩有关。这种增加可能是由于胎盘灌注减少导致的轻度缺氧以及胎儿头部受压导致的迷走神经张力增加。
