Motor Threshold and Motor Cortex Stimulation
The Relationship Between Motor Threshold and Effective Stimulation Threshold During Motor Cortex Stimulation
Motor cortex stimulation (MCS) is a form of brain stimulation for patients with neuropathic pain not responsive to medication. An electrode is placed on the surface of the brain and connected to a programmable battery in the chest.
The strength of stimulation can be individually adjusted by changing the voltage of stimulation. A too high voltage will produce side effects (e.g. seizures) while a too low voltage will not provide pain control. The aim of this study is to analyze the optimal stimulation parameters in patients already implanted with a motor cortex stimulation who have received good pain relief. The actual voltage may vary widely between patients but the investigators feel that there may be an "ideal" voltage if it is measured as a percentage of motor threshold (PMT). If motor threshold is the stimulation voltage that can evoke a muscle contraction then a PMT = 80% would be a voltage that was eighty percent of that value. Although the actual voltage may be widely different between patients, the percentage needed may be very similar. The investigators therefore plan to measure the effect of different percentages of PMT in patients already being treated with motor cortex stimulation.
Systematic analysis of the findings of this study might help the individual participant and future patients to better programming and less side effects.
Studie Overzicht
Toestand
Conditie
Interventie / Behandeling
Gedetailleerde beschrijving
Motor cortex stimulation (MCS) is a form of brain stimulation for patients with medically refractory neuropathic pain. The strength of stimulation can be individually adjusted by changing the voltage of stimulation. Too high voltage will produce side effects (e.g. seizures) while too low voltage will not provide pain control. The aim of this study is to analyze the optimal stimulation parameters in patients already implanted with a motor cortex stimulation who have received good pain relief. The actual voltage may vary widely between patients (because of the individual variations in tissue resistance) but the investigators feel that there may be an "ideal" voltage if it is measured as a percentage of motor threshold (PMT).
If motor threshold is the voltage that can evoke a muscle contraction then a PMT = 80% would be a voltage that was eighty percent of that value. Although the actual voltage may be different between patients, the effective PMT may be similar since it represents a more physiologic measure of stimulation.
Systematic analysis of the findings of this study might help the individual participant and future patients by reducing voltage to the lowest effective setting and reducing the chance of seizures.
Motor cortex stimulation is used in the treatment of neuropathic pain since 1991 but still no guidelines for programming exist and programming is therefore mainly bases on trial and error. This is mostly due to many variables influencing the choice of stimulation parameters and significant individual differences in susceptibility to stimulation. Routinely the motor threshold is determined during programming to identify the superior limit of voltage at which twitching is induced. No stimulation above the motor threshold should be performed as this is known to cause seizures. The voltage of simulation that will be effective for an individual is unknown at the beginning of the treatment.
The investigators try to find the lowest effective voltage because that will reduce the risk of stimulation-induced seizures and prolong the life of the pacemaker.
Studietype
Inschrijving (Werkelijk)
Fase
- Niet toepasbaar
Contacten en locaties
Studie Locaties
-
-
British Columbia
-
Vancouver, British Columbia, Canada, V5Z 4E3
- Vancouver General Hospital
-
-
Deelname Criteria
Geschiktheidscriteria
Leeftijden die in aanmerking komen voor studie
Accepteert gezonde vrijwilligers
Geslachten die in aanmerking komen voor studie
Beschrijving
Inclusion Criteria:
- Adult patient more than 18 years of age
- Chronic neuropathic pain effectively treated with motor cortex stimulation
- Stable medication during the trial
- Willing and able to comply with the study protocol and to return per the follow-up visit schedule and able to provide informed consent.
Exclusion Criteria:
- Evidence of an active disruptive psychiatric disorder or other known condition significant enough to impact the perception of pain, compliance to intervention and/or ability to evaluate treatment outcome as determined by the investigator
- Technical malfunction of the MCS device
- History of seizures
- Unable to provide informed consent
Studie plan
Hoe is de studie opgezet?
Ontwerpdetails
- Primair doel: Behandeling
- Toewijzing: Gerandomiseerd
- Interventioneel model: Crossover-opdracht
- Masker: Enkel
Wapens en interventies
Deelnemersgroep / Arm |
Interventie / Behandeling |
|---|---|
|
Experimenteel: -10% of effective PMT
Patients are set to a voltage 10% less than their original PMT at start of study, Changes in PMT settings
|
The patients current motor threshold is determined and the patient is set to a new PMT (= new treatment arm)
|
|
Actieve vergelijker: former setting (+/- 0% of PMT)
Patients are set to their original PMT at start of study, Changes in PMT settings
|
The patients current motor threshold is determined and the patient is set to a new PMT (= new treatment arm)
|
|
Experimenteel: +10% of effective PMT
Patients are set to a voltage 10% more than their original PMT at start of study, Changes in PMT settings
|
The patients current motor threshold is determined and the patient is set to a new PMT (= new treatment arm)
|
Wat meet het onderzoek?
Primaire uitkomstmaten
Uitkomstmaat |
Tijdsspanne |
|---|---|
|
Change in Pain measured on the Visual Analogue Scale with different PMT Settings
Tijdsspanne: at the End of each trial period, typically 14 days after changes in PMT Settings
|
at the End of each trial period, typically 14 days after changes in PMT Settings
|
Secundaire uitkomstmaten
Uitkomstmaat |
Tijdsspanne |
|---|---|
|
Quality of Life assessment with the SF-36 questionnaire
Tijdsspanne: at the end of each trial period, typically at 14 days
|
at the end of each trial period, typically at 14 days
|
Andere uitkomstmaten
Uitkomstmaat |
Tijdsspanne |
|---|---|
|
Pain assessment with the McGill pain questionnaire to record impact of pain
Tijdsspanne: at the end of each trial period, typically 14 days
|
at the end of each trial period, typically 14 days
|
Medewerkers en onderzoekers
Sponsor
Publicaties en nuttige links
Algemene publicaties
- Tsubokawa T, Katayama Y, Yamamoto T, Hirayama T, Koyama S. Chronic motor cortex stimulation for the treatment of central pain. Acta Neurochir Suppl (Wien). 1991;52:137-9. doi: 10.1007/978-3-7091-9160-6_37.
- Tsubokawa T, Katayama Y, Yamamoto T, Hirayama T, Koyama S. Treatment of thalamic pain by chronic motor cortex stimulation. Pacing Clin Electrophysiol. 1991 Jan;14(1):131-4. doi: 10.1111/j.1540-8159.1991.tb04058.x.
- Peyron R, Garcia-Larrea L, Deiber MP, Cinotti L, Convers P, Sindou M, Mauguiere F, Laurent B. Electrical stimulation of precentral cortical area in the treatment of central pain: electrophysiological and PET study. Pain. 1995 Sep;62(3):275-286. doi: 10.1016/0304-3959(94)00211-V.
- Lima MC, Fregni F. Motor cortex stimulation for chronic pain: systematic review and meta-analysis of the literature. Neurology. 2008 Jun 10;70(24):2329-37. doi: 10.1212/01.wnl.0000314649.38527.93.
Studie record data
Bestudeer belangrijke data
Studie start
Primaire voltooiing (Werkelijk)
Studie voltooiing (Werkelijk)
Studieregistratiedata
Eerst ingediend
Eerst ingediend dat voldeed aan de QC-criteria
Eerst geplaatst (Schatting)
Updates van studierecords
Laatste update geplaatst (Schatting)
Laatste update ingediend die voldeed aan QC-criteria
Laatst geverifieerd
Meer informatie
Termen gerelateerd aan deze studie
Aanvullende relevante MeSH-voorwaarden
Andere studie-ID-nummers
- H14-01258
Deze informatie is zonder wijzigingen rechtstreeks van de website clinicaltrials.gov gehaald. Als u verzoeken heeft om uw onderzoeksgegevens te wijzigen, te verwijderen of bij te werken, neem dan contact op met register@clinicaltrials.gov. Zodra er een wijziging wordt doorgevoerd op clinicaltrials.gov, wordt deze ook automatisch bijgewerkt op onze website .
Klinische onderzoeken op Neuropatische pijn
-
Istanbul University - CerrahpasaWervingPatellofemoral Pain, PFPTurkije (Türkiye)
-
Beijing Sport UniversityNog niet aan het wervenPatellofemoral Pain, PFP
-
Beijing Sport UniversityNog niet aan het wervenPatellofemoral Pain, PFPChina
-
Future University in EgyptVoltooid
-
Camilo Jose Cela UniversityVoltooidMyofascial Pain Syndrome (MPS)Spanje
-
Pamukkale UniversityNog niet aan het wervenPatellofemoral Pain, PFPTurkije (Türkiye)
-
Beijing Sport UniversityVoltooidPatellofemoral Pain, PFPChina
-
Sahmyook UniversityVoltooidMyofascial Pain Syndrome (MPS)Zuid -Korea
-
University of California, DavisNational Institutes of Health (NIH); National Center for Complementary and Integrative...Nog niet aan het wervenChronische lage rugpijn (cLBP) | Myofascial Pain Syndrome (MPS)Verenigde Staten
-
University of North Carolina, Chapel HillCanadian Institutes of Health Research (CIHR)VoltooidPatellofemoraal pijnsyndroom | Patellofemorale pijn (PFPS) | Patellofemorale pijn | Patellofemoral Pain, PFPVerenigde Staten
Klinische onderzoeken op Change of PMT setting
-
University of PennsylvaniaBeëindigdTerugkerende Clostridium Difficile-infectieVerenigde Staten
-
VA Office of Research and DevelopmentWerving
-
Chang Gung Memorial HospitalAanmelden op uitnodiging
-
Athena Feminine Technologies, Inc.VoltooidUrine-incontinentieVerenigde Staten, Maagdeneilanden (VS)
-
Toros UniversityNog niet aan het wervenBaarmoederhalskankerscreening | Borstkankerscreening | Darmkankerscreening | Gedrag ter Preventie van Kanker
-
Virginia Polytechnic Institute and State UniversityNational Institute of Mental Health (NIMH)VoltooidOppositioneel-opstandige stoornisVerenigde Staten
-
Shanxi Normal UniversityVoltooid
-
Karunesh GangulyNational Institute on Deafness and Other Communication Disorders (NIDCD)WervingHartinfarct | Multiple sclerose | Spierdystrofieën | ALS | SCI - RuggenmergletselVerenigde Staten
-
NICHD Pelvic Floor Disorders NetworkEunice Kennedy Shriver National Institute of Child Health and Human Development...VoltooidBekkenorgaanverzakking (POP)Verenigde Staten
-
Chang Gung Memorial HospitalVoltooidLinkerventrikel systolische dysfunctieTaiwan