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Inhibiting the hyperreflexic bladder with electrical stimulation in a spinal animal model
J S Walter1, J S Wheeler, C J Robinson
1Hines Veterans Administration Hospital, Rehabilitation Research and Development Center, Illinois 60141.
Neurourology and Urodynamics
|January 1, 1993
Summary
Electrical stimulation of the pudendal nerve effectively inhibited bladder contractions in spinal cord injured cats. This method offered a more selective approach compared to sacral nerve stimulation, with fewer adverse effects.
Area of Science:
- Neuroscience
- Urology
- Biomedical Engineering
Background:
- Spinal cord injury (SCI) often leads to detrusor overactivity, causing uncontrolled bladder contractions.
- Current management strategies for SCI-induced bladder dysfunction have limitations.
Purpose of the Study:
- To investigate the efficacy of electrical stimulation of various nerves for inhibiting bladder activity in a feline model of chronic SCI.
- To compare the selectivity and side effects of different stimulation methods.
Main Methods:
- Electrical stimulation was applied to the sacral nerves, pudendal nerves, and tibial nerves in unanesthetized, chronic SCI (C6-T1) male cats.
- Bladder activity was monitored after filling above the micturition threshold.
- Stimulation parameters, including frequency (e.g., 1,000 Hz for sacral nerves) and nerve targeted, were varied.
Main Results:
- Pudendal nerve stimulation inhibited bladder contractions in 3 out of 5 cats, demonstrating greater selectivity and fewer side effects (e.g., leg spasms) than sacral nerve stimulation.
- Sacral nerve stimulation inhibited bladder activity in 3 out of 5 cats, but often caused leg spasms and secondary bladder contractions.
- High-frequency (1,000 Hz) sacral nerve stimulation blocked contractions in 2 out of 3 cats but resulted in leg flexion and secondary bladder contractions.
- Tibial nerve stimulation was ineffective and exacerbated bladder activity and leg spasms.
Conclusions:
- Low-frequency pudendal nerve/pelvic floor stimulation represents a relatively effective and selective method for inhibiting bladder overactivity in this SCI model.
- Further research into optimizing pudendal nerve stimulation parameters may offer a promising therapeutic approach for managing neurogenic bladder dysfunction.