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Related Experiment Video

Updated: Jan 6, 2026

Studying the Coding Profiles of Somatic Stimulation on Cardiac-locked Neuronal Responses in the Rat Spinal Dorsal Horn
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First Objective Evidence Characterizing Differences in Cervical and Thoracic Spinal Cord Neurophysiology Using

Johnathan H Goree1, Harold Nijhuis2, Gregory L Smith3

  • 1Department of Anesthesiology, University of Arkansas for Medical Sciences, 801 Cottage Dr, Little Rock, AR, 72205, USA. jhgoree@uams.edu.

Pain and Therapy
|October 9, 2025
PubMed
Summary
This summary is machine-generated.

Closed-loop spinal cord stimulation (CL-SCS) offers precise pain relief by adapting to individual needs. Evoked compound action potential (ECAP)-controlled CL-SCS demonstrates superior accuracy and consistency in both cervical and thoracic regions compared to open-loop systems.

Keywords:
Chronic painClosed-loopECAPSCS

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Area of Science:

  • Neuromodulation
  • Spinal Cord Stimulation (SCS)
  • Pain Management

Background:

  • Open-loop (OL) spinal cord stimulation (SCS) systems have limitations in providing consistent neural activation and pain relief due to fixed parameters.
  • Cervical spinal cord anatomy presents unique challenges for SCS, including reduced cerebrospinal fluid and increased mobility.
  • Limited data exists comparing cervical and thoracic neurophysiology and its impact on SCS neural activation.

Purpose of the Study:

  • To characterize neurophysiological differences between the cervical and thoracic spinal cord regions.
  • To evaluate the impact of these differences on spinal cord stimulation (SCS) dosing and therapy optimization.
  • To assess the efficacy of evoked compound action potential (ECAP)-controlled closed-loop (CL) SCS technology in managing these variations.

Main Methods:

  • A post hoc analysis of global and real-world chronic pain patients implanted with ECAP-controlled CL-SCS systems.
  • Analysis of the relationship between stimulation current and neural activation to identify neurophysiological differences between cervical (n=187) and thoracic (n=1899) regions.
  • Evaluation of neural activation stability in both in-clinic and out-of-clinic settings during postural changes.

Main Results:

  • The cervical spinal cord exhibited significantly lower ECAP thresholds and over 100% higher spinal cord sensitivity compared to the thoracic region (p < 0.001).
  • The cervical therapeutic dosing range was 48% narrower, increasing the risk of overstimulation with OL-SCS.
  • ECAP-controlled CL-SCS significantly improved dose accuracy in both regions (p < 0.001), especially during activities simulating daily living.

Conclusions:

  • This study provides the first objective characterization of cervical and thoracic spinal neurophysiological differences in SCS.
  • ECAP-controlled CL-SCS technology maintains consistent neural activation across both cervical and thoracic regions.
  • Due to heightened sensitivity and a narrow dosing range, ECAP-controlled CL-SCS may offer improved therapeutic outcomes over OL systems for cervical pain.