Hiersch Liran, Salzer Liat, Aviram Amir, Ben-Haroush Avi, Ashwal Eran, Yogev Yariv
a Department of Obstetrics and Gynecology , Helen Schneider Hospital for Women, Rabin Medical Center , Petach Tikva , Israel and.
J Matern Fetal Neonatal Med. 2015;28(14):1633-6. doi: 10.3109/14767058.2014.964677. Epub 2014 Sep 29.
Limited data exist regarding uterine contraction intensity prior to membrane rupture. Using a novel technique of electrical uterine myography (EUM) we aimed to determine which factors affect myometrial activity during active phase of labor.
EUM was prospectively measured in 37 women with singleton pregnancy at term during the active phase of labor until membranes' rupture. EUM was measured using non-invasive nine channels recorder with an EMG amplifier and three-dimensional position sensor. Uterine electrical activity was quantified with the EUM-index, defined as the mean electrical activity of the uterine muscle over a period of 10 min and measured in units of micro-Joule (microwatt per second [mW/s]).
The mean EUM-index at the first 10 min of the measurement was 3.3 ± 0.6 mW/s. In a stepwise linear regression model accounting potential confounders EUM was significantly affected by cervical dilatation (p = 0.005), maternal age (p = 0.04) and previous cesarean delivery status (p = 0.02). In a repeated measurement assessment of non-parametric Fridman's test for all subjects who had at least 10 continuouss EUM measurements, there was a significant increase in electrical uterine activity as labor progressed (p = 0.01).
Electrical uterine activity during the active phase of labor prior to rupture of membranes is affected by maternal age, previous cesarean delivery status and cervical dilatation. Moreover, electrical uterine activity is enhanced throughout labor.
关于胎膜破裂前子宫收缩强度的数据有限。我们使用一种新型的子宫肌电图（EUM）技术，旨在确定在分娩活跃期哪些因素会影响子宫肌层活动。
对37名单胎足月妊娠妇女在分娩活跃期直至胎膜破裂期间进行前瞻性EUM测量。使用带有肌电图放大器和三维位置传感器的非侵入性九通道记录仪测量EUM。子宫电活动通过EUM指数进行量化，EUM指数定义为子宫肌肉在10分钟内的平均电活动，以微焦耳（微瓦每秒[mW/s]）为单位测量。
测量的前10分钟平均EUM指数为3.3±0.6 mW/s。在一个考虑潜在混杂因素的逐步线性回归模型中，EUM受宫颈扩张（p = 0.005）、产妇年龄（p = 0.04）和既往剖宫产史（p = 0.02）的显著影响。在对所有至少有10次连续EUM测量的受试者进行的非参数弗里德曼重复测量评估中，随着分娩进展，子宫电活动显著增加（p = 0.01）。
胎膜破裂前分娩活跃期的子宫电活动受产妇年龄、既往剖宫产史和宫颈扩张的影响。此外，整个分娩过程中子宫电活动都会增强。
