Related Experiment Videos
Evoked potentials from the lower urinary tract. II. The spino-cortical neuraxis. A methodological study.
T C Gerstenberg1, J Nordling, T Hald
1Department of Urology, Herlev Hospital, University of Copenhagen, Denmark.
Scandinavian Journal of Urology and Nephrology. Supplementum
|January 1, 1991
Summary
This study recorded spinal and cerebral evoked potentials (EPs) from the pudendal nerve, bladder, and urethra. It found distinct EP waveform patterns, aiding in understanding sensory pathways.
Area of Science:
- Neuroscience
- Urology
- Neurophysiology
Background:
- Understanding the sensory pathways of the pelvic organs is crucial for diagnosing and treating various neurological and urological conditions.
- Evoked potentials (EPs) offer a non-invasive method to assess the integrity of neural pathways.
- Previous research has explored somatosensory evoked potentials (SEPs) but detailed characterization of EPs from specific pelvic structures remains limited.
Purpose of the Study:
- To investigate and characterize spinal and cerebral evoked potentials (EPs) following stimulation of the dorsal nerve of the penis, clitoris, bladder wall, and posterior urethra.
- To compare the waveform configurations and latencies of EPs generated from different pelvic nerve pathways.
- To evaluate the feasibility of using EPs to assess central spinal pathway conduction times.
Main Methods:
- Recorded spinal (L1) and cerebral cortical evoked potentials (EPs) in 20 healthy subjects (10 males, 10 females) using computer averaging.
- Stimulated the dorsal nerve of the penis, clitoris (pudendal nerve), bladder wall, and posterior urethra.
- Also recorded responses from the posterior tibial nerve for comparison and calculated central conduction times.
Main Results:
- Consistent cortical EPs were obtained from pudendal nerve, bladder wall, and posterior urethra stimulation, with maximal responses at the CZ-2 cm scalp location.
- Pudendal nerve stimulation yielded a W-shaped SEP with a positive peak (P1) around 42.0 msec.
- Endovesical (bladder) and endourethral (posterior urethra) stimulation produced M-shaped responses with a prominent negative peak (N1) around 103-104 msec.
Conclusions:
- Distinct somatosensory evoked potential (SEP) waveform patterns differentiate pudendal nerve stimulation from bladder and urethral stimulation.
- Cortical EPs are reliably recordable from these pelvic structures, suggesting their utility in clinical neurophysiological assessment.
- The findings provide a basis for calculating central spinal pathway conduction times and diagnosing related neurological dysfunctions.