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EVOKE ECAP-řízené umístění a programování elektrody u pacientů s chronickou bolestí (ECAP)

18. září 2026 aktualizováno: Barts & The London NHS Trust

This study is designed to evaluate the feasibility of using intra-operative ECAP and Late-Response (LR) recordings for confirmation of activating the neuronal target of the dorsal column in a single-stage SCS lead placement procedure. The collected ECAP and LR data will be analysed post-hoc to further evaluate its utility for determining the laterality of lead placement with respect to the physiologic midline of the dorsal column.

Přehled studie

Postavení

Staženo

Podmínky

Intervence / Léčba

Detailní popis

The primary objectives of the study will be to evaluate the feasibility of using intra-operative ECAP and LR recordings for confirming the activation of the neural target of the dorsal column in a single-stage SCS lead placement procedure. The collected ECAP and LR data will be analysed post-hoc to further evaluate its utility for determining the laterality of lead placement with respect to the physiologic midline of the dorsal column. Change in pain intensity (Visual Analogue Scale = VAS) will be evaluated after 3-months of the targeted (primary) pain area.

Conventional open-loop SCS devices produce paraesthesia (a tingling sensation) that overlap the pain distribution, with the intent of masking pain perception. It is thought that conventional open-loop SCS success depends on adequacy and durability of paraesthesia coverage as well as patient tolerance of the induced sensations. For the last 40 years, the primary focus of innovation for SCS for chronic pain has been to improve the reliability of overlapping paraesthesia's with distribution of pain. Achieving adequate and stable paraesthesia coverage in the chronic pain region is known to be challenging, making back pain more difficult to treat and limiting application mostly to patients with predominant leg pain. Therefore, the use of neurostimulation for the treatment of chronic pain (especially back) shows mixed results. Declining efficacy over time has been observed in studies using low-frequency SCS programming.

Programming in the EVOKE Randomized Controlled Trial (RCT) study was performed using objective, neurophysiological feedback i.e., ECAPs for the first time since the advent of SCS to program both the control (open-loop) and test (closed-loop) chronic low back and/or leg pain patients. The trial has shown the superior long-term efficacy and durability of closed-loop SCS in treatment of chronic back and leg pain. Unpublished data collected during the study showed that objective EVOKE ECAP-based programming does not require paraesthesia overlap with pain distribution to achieve successful outcomes in low back (axial or radicular) and leg pain patients. Evaluation of data demonstrated that at 12-months follow-up (EVOKE study), 27% of subjects did not report paraesthesia in the low back region and reported 82% and 72% back pain relief with closed-loop and open-loop SCS, respectively. This is compared to 75% and 69% pain relief, respectively, in subjects who reported paraesthesia. Therefore, no interaction between the treatment effect and paraesthesia (p = 0.775) exist (EVOKE study).

The secondary objective of this observational study is to evaluate the overlap of the dermatomal pain map with the paraesthesia coverage provided by ECAP-based programming by asking the patient to report how much percentage of the primary pain area is covered by paraesthesia.

Additionally, the patients will be followed-up for 12-months and treatment outcomes (Evaluate long-term clinical outcomes (PROMIS 29+2 Profile v2.1, VAS, long-term responders in terms of pain relief, subject satisfaction with asleep lead placement, stimulation programming characteristics, neurophysiological characteristics) will be captured pre-treatment at baseline, at 3-months, 6-months and 12-months post-activation and initial programming of the closed-loop Stimulator (CLS).

Typ studie

Pozorovací

Kontakty a umístění

Tato část poskytuje kontaktní údaje pro ty, kteří studii provádějí, a informace o tom, kde se tato studie provádí.

Studijní místa

Kritéria účasti

Výzkumníci hledají lidi, kteří odpovídají určitému popisu, kterému se říká kritéria způsobilosti. Některé příklady těchto kritérií jsou celkový zdravotní stav osoby nebo předchozí léčba.

Kritéria způsobilosti

Věk způsobilý ke studiu

18 let až 75 let (Dospělý, Starší dospělý)

Přijímá zdravé dobrovolníky

Ne

Pohlaví způsobilá ke studiu

Všechno

Metoda odběru vzorků

Vzorek nepravděpodobnosti

Studijní populace

Patients with chronic predominant back as deemed suitable for SCS treatment

Popis

Inclusion Criteria:

  1. Be 18-75 years of age or older at the time of enrolment.
  2. Symptoms of chronic predominant back pain for at least 6-months, with a minimum pain intensity of 5/10 in the primary pain area on VAS pain intensity questionnaire.
  3. Be an appropriate candidate for the surgical procedures required in this study based on the clinical judgment of the implanting physician.
  4. Be capable of subjective evaluation, able to read and understand English-written questionnaires, and able to read, understand and sign the written inform consent in English.
  5. Be willing and capable of giving informed consent.
  6. Be willing and able to comply with study-related requirements, procedures, and visits.

Exclusion Criteria:

Have a medical condition or pain in other area(s), not intended to be treated with SCS, that could interfere with study procedures, accurate pain reporting, and/or confound evaluation of study endpoints, as determined by the Investigator.

2. Have evidence of an active disruptive psychological or psychiatric disorder or other known condition significant enough to impact perception of pain, compliance of intervention, and/or ability to evaluate treatment outcomes.

3. Subjects with chronic alcohol abuse or currently in rehabilitation. 4. Be benefitting within from an interventional procedure and/or surgery to treat chronic pain (Subjects should be enrolled at least 30 days from last benefit).

5. Have prior experience with SCS. 6. Have an existing drug pump and/or another active implantable device such as a pacemaker.

7. Have a condition currently requiring or likely to require the use of diathermy.

8. Have an active systemic or local infection at the anticipated needle entry site.

9. Be pregnant (if female and sexually active, subject must be using a reliable form of birth control, be surgically sterile or be at least 2 years post-menopausal).

10. Are currently nursing (if female).

11. Be concomitantly participating in another clinical study.

Studijní plán

Tato část poskytuje podrobnosti o studijním plánu, včetně toho, jak je studie navržena a co studie měří.

Jak je studie koncipována?

Detaily designu

  • Observační modely: CASE_CONTROL
  • Časové perspektivy: PROSPECTIVE

Co je měření studie?

Primární výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Visual Analogue Scale (VAS), 0-100 where 0 is no pain and 100 is worst pain.
Časové okno: Baseline

Evaluate average pain relief using the Visual Analogue Scale (VAS).

Baseline
Difference in Visual Analogue Scale (VAS), 0-100 where 0 is no pain and 100 is worst pain.
Časové okno: Baseline and 3 months

Evaluate average pain relief using the Visual Analogue Scale (VAS). Percentage change in average pain intensity in the primary region of pain on the VAS.

Baseline and 3 months
Difference in Visual Analogue Scale (VAS), 0-100 where 0 is no pain and 100 is worst pain.
Časové okno: Baseline, 3 month and 6 months

Evaluate average pain relief using the Visual Analogue Scale (VAS).Percentage change in average pain intensity in the primary region of pain on the VAS.

Baseline, 3 month and 6 months
Difference Visual Analogue Scale (VAS), 0-100 where 0 is no pain and 100 is worst pain.
Časové okno: Baseline, 3, 6 and 12 months

Evaluate average pain relief using the Visual Analogue Scale (VAS).Percentage change in average pain intensity in the primary region of pain on the VAS.

Baseline, 3, 6 and 12 months

Sekundární výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Pain Symptoms map.
Časové okno: Baseline

Mapping areas of pain

Baseline
Pain Symptoms map.
Časové okno: Baseline and 3 months

Mapping areas of pain

Baseline and 3 months
Pain Symptoms map.
Časové okno: Baseline and 6 months

Mapping areas of pain

Baseline and 6 months
Pain Symptoms map.
Časové okno: Baseline and 12 months

Mapping areas of pain

Baseline and 12 months
Paraesthesia coverage dermatomal map for final programming settings.
Časové okno: 3, 6 and 12 months

Patient will be asked to report how much percentage of the primary pain area is covered by paraesthesia.

3, 6 and 12 months
Quality of Life and Function change using the PROMIS 29+2 Profile v2.1.
Časové okno: baseline to 3-months, 6-months and 12-months

Change in score using the PROMIS 29+2 Profile v2.1. The scale is 1-5 where 1 is unable to do and 5 is without any difficulty.

baseline to 3-months, 6-months and 12-months
Quality of Life and Function change using Subject Global Impression of Change (PGIC) scale
Časové okno: baseline to 3-months, 6-months and 12-months

change in Subject Global Impression of Change (PGIC) scale. The scale is 1-5 where 1 is very unsatisfied and 5 is very satisfied

baseline to 3-months, 6-months and 12-months
Quality of Life and Function change using Satisfaction scale
Časové okno: baseline to 3-months, 6-months and 12-months

change in satisfaction scale. The scale is 1-5 where 1 is very unsatisfied and 5 is very satisfied.

baseline to 3-months, 6-months and 12-months
Quality of Life and Function change in sleep questionnaire
Časové okno: baseline to 3-months, 6-months and 12-months

Patient reports change in sleep quality and disturbance. The scale is 1-5 where 1 is very poor and very good.

baseline to 3-months, 6-months and 12-months

Spolupracovníci a vyšetřovatelé

Zde najdete lidi a organizace zapojené do této studie.

Sponzor

Termíny studijních záznamů

Tato data sledují průběh záznamů studie a předkládání souhrnných výsledků na ClinicalTrials.gov. Záznamy ze studií a hlášené výsledky jsou před zveřejněním na veřejné webové stránce přezkoumány Národní lékařskou knihovnou (NLM), aby se ujistily, že splňují specifické standardy kontroly kvality.

Hlavní termíny studia

Začátek studia (Aktuální)

27. října 2023

Primární dokončení (Aktuální)

12. srpna 2025

Dokončení studie (Aktuální)

12. srpna 2025

Termíny zápisu do studia

První předloženo

13. ledna 2023

První předloženo, které splnilo kritéria kontroly kvality

25. ledna 2023

První zveřejněno (Aktuální)

30. ledna 2023

Aktualizace studijních záznamů

Poslední zveřejněná aktualizace (Aktuální)

22. září 2026

Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality

18. září 2026

Naposledy ověřeno

1. září 2026

Více informací

Termíny související s touto studií

Další identifikační čísla studie

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Plán pro data jednotlivých účastníků (IPD)

Plánujete sdílet data jednotlivých účastníků (IPD)?

NE

Popis plánu IPD

We will follow the policies laid by the local information governance team at Barts Health NHS Trust and NHS code of Confidentiality in accordance to the data protection act.

Informace o lécích a zařízeních, studijní dokumenty

Studuje lékový produkt regulovaný americkým FDA

Ne

Studuje produkt zařízení regulovaný americkým úřadem FDA

Ano

produkt vyrobený a vyvážený z USA

Ne

Tyto informace byly beze změn načteny přímo z webu clinicaltrials.gov. Máte-li jakékoli požadavky na změnu, odstranění nebo aktualizaci podrobností studie, kontaktujte prosím register@clinicaltrials.gov. Jakmile bude změna implementována na clinicaltrials.gov, bude automaticky aktualizována i na našem webu .