Abstract | OBJECTIVE: METHODS: The effects of burst and tonic SCS were compared by recording neuronal firing before and after each mode of stimulation at day 7 following a painful cervical nerve root compression. Neuronal firing was also recorded before and after burst and tonic SCS in the presence of the GABAB receptor antagonist, CGP35348. RESULTS: Burst and tonic SCS both reduce neuronal firing. The effect of tonic SCS, but not burst SCS, is blocked by CGP35348. In a separate study, spinal cord stimulators were implanted to deliver burst or tonic SCS beginning on day 4 after painful nerve root compression; allodynia and serum GABA concentration were measured through day 14. Burst and tonic SCS both reduce allodynia. Tonic SCS attenuates injury-induced decreases in serum GABA, but GABA remains decreased from baseline during burst SCS. CONCLUSION AND SIGNIFICANCE: Together, these studies suggest that burst SCS does not act via spinal GABAergic mechanisms, despite its attenuation of spinal hyperexcitability and allodynia similar to that of tonic SCS; understanding other potential spinal inhibitory mechanisms may lead to enhanced analgesia during burst stimulation.
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Authors | Nathan D Crosby, Christine L Weisshaar, Jenell R Smith, Martha E Zeeman, Melanie D Goodman-Keiser, Beth A Winkelstein |
Journal | IEEE transactions on bio-medical engineering
(IEEE Trans Biomed Eng)
Vol. 62
Issue 6
Pg. 1604-13
(Jun 2015)
ISSN: 1558-2531 [Electronic] United States |
PMID | 25667344
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- GABA Antagonists
- gamma-Aminobutyric Acid
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Topics |
- Animals
- Behavior, Animal
(physiology)
- GABA Antagonists
- Hyperalgesia
- Male
- Neuralgia
(therapy)
- Pain Management
(methods)
- Radiculopathy
(physiopathology)
- Rats
- Spinal Cord Stimulation
- gamma-Aminobutyric Acid
(metabolism)
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