Bundsen P, Ericson K
Acta Obstet Gynecol Scand. 1982;61(1):1-5. doi: 10.3109/00016348209156941.
A current density standard for current shapes used in transcutaneous electrical nerve stimulation (TNS) must be established in order to avoid harmful effects. This is especially important when stimulating near vital structures such as the fetal heart. In the absence of an applicable standard, a preliminary safety norm is proposed, based on clinical experience during delivery and experimental measurements in the female bladder. Current densities due to TNS not exceeding 0.5 microamperemeter/mm2 are safe for the fetal heart. A stimulator and electrodes fulfilling the safety criteria proposed in this study have been tested. A filter which suppresses the electrical disturbances occurring during TNS, thereby permitting recording of the fetal heart rate during birth, has also been tested. TNS was given over both the low-back and suprapubic region. Results of clinical tests of the equipment during 15 supervised births are reported. No adverse effect in the mother or newborn infant were observed.
为避免有害影响，必须建立用于经皮电神经刺激（TNS）的电流形状的电流密度标准。在刺激胎儿心脏等重要结构附近时，这一点尤为重要。在缺乏适用标准的情况下，基于分娩期间的临床经验和女性膀胱的实验测量结果，提出了一项初步安全规范。TNS引起的电流密度不超过0.5微安/毫米²对胎儿心脏是安全的。已对符合本研究提出的安全标准的刺激器和电极进行了测试。还测试了一种滤波器，该滤波器可抑制TNS期间出现的电干扰，从而允许在分娩期间记录胎儿心率。TNS作用于下背部和耻骨上区域。报告了该设备在15例有监督分娩期间的临床试验结果。未观察到对母亲或新生儿有不良影响。
