Loening-Baucke V, Read N W, Yamada T
Department of Pediatrics, University of Iowa, Iowa City.
Electroencephalogr Clin Neurophysiol. 1991 Nov-Dec;80(6):490-5. doi: 10.1016/0168-5597(91)90130-p.
We obtained reproducible cortical evoked potentials (EPs) in response to electrical stimulation of the rectum with 1 Hz frequency. We found 2 distinctly different EPs in response to rectal stimulation. In 5 females, the EP had an early onset latency (mean 26 msec) with multiple positive and negative peaks. In 10 females, the EP had a later onset latency (mean 52 msec) and a trifid configuration, having a very prominent negative peak. The early onset EPs after rectal stimulation appeared very similar to the wave form of the cortical EPs recorded after pudendal nerve stimulation. Finding similar interpeak latencies in the early onset EP after rectal stimulation and the EP after pudendal nerve stimulation suggests that either the same pathway was used or that rectal stimulation also stimulated the pudendal nerve. It appears that we stimulated visceral afferents when we recorded late onset EPs, because the large EP amplitude declined rapidly with faster stimulation rates and also with greater number of averaging, and the sensation threshold was very unstable, all different to somatosensory EPs.
我们通过以1赫兹频率电刺激直肠获得了可重复的皮层诱发电位（EPs）。我们发现对直肠刺激有两种明显不同的EPs。在5名女性中，EPs起始潜伏期较早（平均26毫秒），有多个正负波峰。在10名女性中，EPs起始潜伏期较晚（平均52毫秒），呈三叉形，有一个非常突出的负波峰。直肠刺激后的早期起始EPs与阴部神经刺激后记录的皮层EPs波形非常相似。在直肠刺激后的早期起始EPs和阴部神经刺激后的EPs中发现相似的峰间潜伏期，这表明要么使用了相同的通路，要么直肠刺激也刺激了阴部神经。当我们记录晚期起始EPs时，似乎刺激的是内脏传入神经，因为大的EP波幅随着更快的刺激频率以及更多的平均次数而迅速下降，并且感觉阈值非常不稳定，这些都与躯体感觉EPs不同。
