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Temporal pattern of stimulation modulates reflex bladder activation by pudendal nerve stimulation
Meredith J McGee1, Warren M Grill2,3,4,5
1Department of Biomedical Engineering, Duke University, Durham, North Carolina.
Neurourology and Urodynamics
|July 7, 2015
Summary
Electrical stimulation of the pudendal nerve (PN) can restore bladder control. This study found that while stimulation patterns affect bladder contractions, regular frequency stimulation is most effective for neural prosthetics.
Area of Science:
- Neuroscience
- Urology
- Biomedical Engineering
Background:
- Restoring bladder function in patients with lower urinary tract dysfunction is crucial.
- Electrical stimulation of pudendal nerve (PN) afferents offers a promising therapeutic avenue.
Purpose of the Study:
- To investigate if bladder activation via pudendal afferent stimulation depends on stimulation patterns.
- To determine if specific temporal patterns yield greater bladder contractions than constant frequency stimulation.
Main Methods:
- Measuring bladder contraction pressures evoked by various pudendal nerve stimulation patterns in anesthetized cats.
- Utilizing a computational model of the spinal neural network to analyze reflex mechanisms.
Main Results:
- Stimulation patterns significantly influenced evoked bladder contraction magnitude.
- Several temporal patterns matched regular stimulation effectiveness, but none surpassed it.
- Random patterns, pauses, burst activity, or high-frequency components reduced bladder contractions.
Conclusions:
- Bladder response to pudendal afferent stimulation is influenced by both pattern and frequency.
- Computational modeling indicated interneuron dynamics in the spinal cord mediate patterned stimulation effects.
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