Kavsek G, Pajntar M, Leskosek B
Department of Obstetrics and Gynecology, University Medical Centre, Ljubljana, Slovenia.
Gynecol Obstet Invest. 1999;48(2):81-4. doi: 10.1159/000010144.
The aim of this study was to evaluate the electromyographic (EMG) activity of the uterus concerning the placental implantation site. In a clinical trial, 55 pregnant women in the last trimester of pregnancy were enrolled. They were divided into two major groups: 25 women had placental implantation site on the anterior and 30 women on the posterior uterine wall. With regard to the presence/nonpresence of contractions, each group was further divided into two subgroups. Uterine EMG activity was recorded by electrodes placed on the abdominal wall. All signals were transferred through a series of amplifiers. Amplified and filtered EMG signals were digitized and written on a hard disk, simultaneously with the signals of external tocodynamometry. From the 30-min EMG recording, we calculated the average root mean square (RMS) and the average median frequency (MF) of the signal. A significant difference of the abdominal EMG activity concerning the placental implantation site was found only in pregnant women with contractions. The RMS was significantly lower in the placental implantation site on the anterior uterine wall, whereas the MF was significantly higher. It can be concluded that the placental implantation site influences the uterine EMG activity registered through the abdominal wall, especially when registered above the placental implantation site.
本研究的目的是评估子宫肌电图（EMG）活动与胎盘植入部位的关系。在一项临床试验中，纳入了55名妊娠晚期孕妇。她们被分为两大组：25名妇女的胎盘植入部位在子宫前壁，30名妇女的胎盘植入部位在子宫后壁。根据是否存在宫缩，每组又进一步分为两个亚组。通过放置在腹壁上的电极记录子宫肌电图活动。所有信号通过一系列放大器进行传输。放大和滤波后的肌电图信号被数字化并写入硬盘，同时记录外部宫缩图信号。从30分钟的肌电图记录中，我们计算了信号的平均均方根（RMS）和平均中频（MF）。仅在有宫缩的孕妇中发现，与胎盘植入部位相关的腹部肌电图活动存在显著差异。子宫前壁胎盘植入部位的RMS显著较低，而MF显著较高。可以得出结论，胎盘植入部位会影响通过腹壁记录的子宫肌电图活动，尤其是在胎盘植入部位上方进行记录时。
