Abstract
Background
Spinal cord stimulation (SCS) is an established treatment option for patients with refractory chronic pain conditions. While effects of SCS on dorsal horn neuronal circuitries are intensively studied, current knowledge on the impact of SCS on descending pain pathways is scarce and relies on preclinical data. We aimed to address this topic and hypothesized a significant effect of SCS on descending pain modulation. In light of current efforts to determine the sensitivity of “static” versus “dynamic” somatosensory parameters to characterize pathophysiological pain conditions, all SCS patients were carefully investigated using both classes of somatosensory outcome parameters.
Methods
Descending pain pathways were investigated by using a “Cold Pressor Test.” This test enables to evaluate the efficacy of conditioned pain modulation (CPM) at the individual level. CPM efficacy was assessed in eight neuropathic pain patients (age 55.5 ± 10.6) during the two conditions stimulator “ON” and “OFF.” The impact of SCS on “static” and “dynamic” somatosensory parameters was explored by using a quantitative sensory testing (QST) battery.
Results
CPM efficacy on pressure pain sensitivity was nearly absent during “OFF” (− 1.2 ± 5.6% facilitation), but increased significantly to 16.3 ± 3.4% inhibition during “ON” (p = 0.03). While most “static” nociceptive QST parameters, represented by mechanical/thermal pain thresholds, exhibited only small effects of SCS (p > 0.05), the wind-up ratio was strongly reduced to within the normal range during “ON” (p = 0.04; Cohen’s d = 1.0). Dynamic mechanical allodynia was abolished in six of seven patients.
Conclusions
Our study provides first human evidence for an impact of SCS on descending pain pathways in the dorsolateral funiculus and emphasizes the significance of “dynamic” pain measures like “CPM”-efficacy and “temporal summation” to evaluate SCS treatment effects. Future prospective studies may use these measures of nociceptive processing to predict SCS therapy response.
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Abbreviations
- CDT:
-
Cold detection threshold
- CPM:
-
Conditioned pain modulation
- CPT:
-
Cold pain threshold
- DMA:
-
Dynamic mechanical allodynia
- HPT:
-
Heat pain threshold
- MDT:
-
Mechanical detection threshold
- MPT:
-
Mechanical pain threshold
- MPS:
-
Mechanical pain sensitivity
- PHS:
-
Paradoxical heat sensations
- PPT:
-
Pressure pain threshold
- PTT:
-
Pain tolerance time
- QST:
-
Quantitative sensory testing
- SD:
-
Standard deviation
- SEM:
-
Standard error of the mean
- SCS:
-
Spinal cord stimulation
- TS:
-
Temporal summation
- TSL:
-
Thermal sensory limen
- VDT:
-
Vibration detection threshold
- WDT:
-
Warm detection threshold
- WUR:
-
Wind-up ratio
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Acknowledgments
We thank Yvonne Neu for her excellent technical support.
Funding
This work was supported by the “Deutsche Forschungsgemeinschaft” (DFG), SFB 1158 (From nociception to chronic pain: Structure-function properties of neural pathways and their reorganization).
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from all individual participants included in the study.
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This article is part of the Topical Collection on Functional Neurosurgery-Pain
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Schuh-Hofer, S., Fischer, J., Unterberg, A. et al. Spinal cord stimulation modulates descending pain inhibition and temporal summation of pricking pain in patients with neuropathic pain. Acta Neurochir 160, 2509–2519 (2018). https://doi.org/10.1007/s00701-018-3669-7
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DOI: https://doi.org/10.1007/s00701-018-3669-7