Fendel H, Jung H, Renoldi A
Z Geburtshilfe Perinatol. 1977 Dec;181(6):396-401.
The rheobase (fundamental current strength), which can be used in obstetrics as a parameter of neuromuscular excitability, alters at the onset of labor, as Jung et al. first reported in 1969. It can be determined objectively to a considerable degree using the single-channel myograph manufactured by the Thönnies company, and an improved measuring method. Results of preliminary investigations can be confirmed which indicate that the rheobase in patients with premature labor and bleeding is lower than in women whose pregnancy is normal. Thus, where there is a risk of miscarriage or premature birth, neuromuscular excitability is increased. The fact that rheobase values in some patients who had undergone cerclage for cervical insufficiency are depressed indicates that the insufficiency is partly due to premature labor. It remains open to question whether etiology of the depressed rheobase is an indicator of increased neuromuscular excitability where there is a risk of miscarriage or premature birth.
基强度（基本电流强度），在产科学中可用作神经肌肉兴奋性的一个参数，自荣格等人于1969年首次报道以来，在分娩开始时会发生变化。使用托尼斯公司生产的单通道肌动描记器和一种改进的测量方法，可以在相当程度上客观地确定基强度。初步调查结果可以得到证实，即早产和出血患者的基强度低于正常妊娠女性。因此，在有流产或早产风险的情况下，神经肌肉兴奋性会增加。一些因宫颈机能不全接受宫颈环扎术的患者基强度值降低，这一事实表明机能不全部分是由早产引起的。对于基强度降低的病因是否是有流产或早产风险时神经肌肉兴奋性增加的一个指标，仍有待探讨。
