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ECAP-Controlled Closed-Loop Spinal Cord Stimulation for Chronic Nonsurgical Refractory Back Pain: Subgroup Analysis

Corey W Hunter1, Jeffrey S Raskin2,3, Nagy A Mekhail4

  • 1Ainsworth Institute of Pain Management, New York, NY.

Spine
|July 1, 2025
PubMed
Summary

Evoked compound action potential (ECAP)-controlled closed-loop spinal cord stimulation (SCS) significantly improved pain and function in patients with chronic non-surgical refractory back pain (NSRBP). This innovative SCS therapy offers a safe and effective treatment option, reducing opioid use in many patients.

Keywords:
Persistent Spinal Pain Syndrome Type 1closed-loopevoke-compound action potentialneurophysiological dose metricsnonsurgical refractory back painspinal cord stimulation

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Area of Science:

  • Neurology
  • Pain Management
  • Biomedical Engineering

Background:

  • Chronic non-surgical refractory back pain (NSRBP) poses significant challenges, often inadequately managed by traditional treatments.
  • Innovations in spinal cord stimulation (SCS), such as closed-loop systems, aim to overcome limitations of fixed-output devices.
  • Physiologic ECAP-controlled closed-loop SCS represents a novel approach for NSRBP management, with limited long-term outcome data.

Purpose of the Study:

  • To evaluate the efficacy and safety of ECAP-controlled closed-loop SCS in patients with NSRBP.
  • To assess pain-related outcomes, holistic treatment response, and neurophysiologic metrics.
  • To analyze changes in opioid use and system performance at 12-month follow-up.

Main Methods:

  • Subgroup analysis of 68 patients with NSRBP from two prospective multicenter clinical trials.
  • Collection of patient-reported outcomes including pain intensity, physical function, quality of life, sleep, and emotional function.
  • Assessment of opioid use reduction and objective device metrics (system utilization, dose accuracy, loop performance).

Main Results:

  • At 12 months, 79% of patients achieved ≥50% pain reduction, with 48% experiencing ≥80% relief.
  • Significant improvements were noted across all patient-reported outcome measures at 3 and 12 months.
  • Approximately 50% of opioid-using patients reduced or eliminated their use; system utilization exceeded 80% with high dose accuracy.

Conclusions:

  • ECAP-controlled closed-loop SCS is a safe and effective treatment for patients with NSRBP.
  • The technology demonstrates significant improvements in pain, function, and quality of life.
  • Closed-loop SCS offers a promising alternative for managing chronic back pain, potentially reducing reliance on opioids.