Fukamauchi K
Nihon Sanka Fujinka Gakkai Zasshi. 1985 Jul;37(7):1081-90.
Together with a recording of external tocogram (Ex. toc.), intra-uterine pressure (IUP) and pressure between fetus and birth canal (PFB) were measured simultaneously and continuously, in 77 women during labor who were showing uterine contraction (UC) with bearing-down efforts (BDE). UC curves with BDE were analyzed to detect characteristic features and the sequence of their change in the second stage of labor. The following results were obtained. IUP curves were able to be classified into three types (Type A, B and C) according to the characteristics of the BDE waveform. This means of categorization was also able to be applied to the waveforms of PFB and Ex. toc., because those two pressure curves were essentially the same as that of IUP. Most of the type A contractions were observed early in the second stage of labor, and type B and C made their appearance successively. During the period of labor, from the first appearance of BDE on UC until the termination of the delivery, the mean frequency of UC with BDE was estimated to be 43 times in premiparae (Type A 5.8, Type B 19.7 and Type C 15.5 times) and 13 times in multiparae (Type A 2.0, Type B 2.7 and Type C 7.6 times). 3) Clinical significance from the point of view of parameters was as follows. The peak pressure of IUP increased slightly as labor progressed and the mean levels were 14.4kPa in Type A, 17.7kPa in Type B and 23.5kPa in Type C, respectively. PFB peak pressure, however, remained close to 50kPa in all cases irrespective of the type of curve. The mean BDE pressure was about a half the mean peak pressure for IUP and PFB respectively. The ratio of the levels of peak pressure of PFB and IUP (PFB/IUP ratio) were found to be approximately from 2.04 to 3.12. By a power spectrum analysis, the maximum levels of power in Type B curves were found at both 0.01 Hz and 0.2 Hz. The differential calculus curves estimated from IUP with BDE were able to be divided into three types, and the maximum value in Type B curves of IUP was 12.8kPa/sec. The IUP levels were plotted against those of PFB estimated from UC curves and the curve obtained indicated a straight line relationship. The levels of PFB were consistently two or three times higher than those of IUP.(ABSTRACT TRUNCATED AT 400 WORDS)
在77名分娩期出现子宫收缩（UC）并伴有向下用力（BDE）的女性中，同时连续测量子宫内压（IUP）、胎儿与产道之间的压力（PFB）以及外部宫缩图（Ex.toc.）记录。分析伴有BDE的UC曲线，以检测第二产程中其特征及变化顺序。结果如下：根据BDE波形特征，IUP曲线可分为三种类型（A、B和C型）。这种分类方法也适用于PFB和Ex.toc.的波形，因为这两条压力曲线与IUP曲线基本相同。大多数A型宫缩出现在第二产程早期，B型和C型依次出现。在分娩期间，从UC上首次出现BDE到分娩结束，初产妇伴有BDE的UC平均频率估计为43次（A型5.8次、B型19.7次、C型15.5次），经产妇为13次（A型2.0次、B型2.7次、C型7.6次）。3）从参数角度来看，临床意义如下：随着产程进展，IUP峰值压力略有增加，A型平均水平为14.4kPa，B型为17.7kPa，C型为23.5kPa。然而，无论曲线类型如何，PFB峰值压力在所有情况下均接近50kPa。BDE平均压力分别约为IUP和PFB平均峰值压力的一半。发现PFB与IUP峰值压力水平之比（PFB/IUP比值）约为2.04至3.12。通过功率谱分析，发现B型曲线在0.01Hz和0.2Hz处功率最高。由伴有BDE的IUP估计的微分曲线可分为三种类型，IUP的B型曲线最大值为12.8kPa/秒。将IUP水平与根据UC曲线估计的PFB水平绘制在一起，得到的曲线呈直线关系。PFB水平始终比IUP水平高两到三倍。（摘要截选至400字）
