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Related Experiment Video

Updated: Jun 21, 2025

The Evoked Potential Operant Conditioning System EPOCS: A Research Tool and an Emerging Therapy for Chronic Neuromuscular Disorders
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Identifying SCS Trial Responders Immediately After Postoperative Programming with ECAP Dose-Controlled Closed-Loop

Jason E Pope1, Ajay Antony2, Erika A Petersen3

  • 1Evolve Restorative Center, 220 Concourse Boulevard, Santa Rosa, CA, 95403, USA. popeje@me.com.

Pain and Therapy
|July 8, 2024
PubMed
Summary

Closed-loop spinal cord stimulation (CL-SCS) with evoked compound action potential (ECAP) allows early, accurate prediction of trial success. This method improves spinal cord stimulation trial outcomes and reduces patient burden.

Keywords:
Closed loopECAPEvoked compound action potentialNeuromodulationSCSSpinal cord stimulation

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Area of Science:

  • Neurology
  • Biomedical Engineering

Background:

  • Traditional spinal cord stimulation (SCS) screening trials have limitations, potentially impacting outcomes and long-term success prediction.
  • Evoked compound action potential (ECAP) based closed-loop (CL) SCS offers objective neural activation confirmation and real-time stimulation adjustment.

Purpose of the Study:

  • To evaluate the immediate patient-reported and neurophysiologic response to CL-SCS.
  • To assess the feasibility of predicting SCS trial responders early using ECAP technology.

Main Methods:

  • Compared patient-reported pain relief and function from Day 0 to end of trial (EOT) in 132 participants.
  • Analyzed ECAP neurophysiologic measurements from Day 0 and EOT, comparing responder groups.

Main Results:

  • Achieved a high positive predictive value (98.4%) for trial success prediction on Day 0.
  • Observed no significant difference in initial ECAP measures between groups, but responders showed higher therapeutic usage at EOT.
  • Reported a false-positive rate of 5.6%.

Conclusions:

  • Day 0 evaluation using ECAP-CL-SCS provides high confidence in predicting trial outcomes, potentially reducing patient burden and complications.
  • ECAP-controlled CL-SCS offers objective data and rapid pain relief, enhancing the prognostic accuracy of SCS trials.