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A Multicenter Study of Hippocampal Electrical Stimulation (HS, in Mesial Temporal Lobe Epilepsy (METTLE)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00717431
Recruitment Status : Terminated (insufficient enrolment)
First Posted : July 17, 2008
Last Update Posted : April 2, 2012
University of Western Ontario, Canada
University of Toronto
Dalhousie University
University of Alberta
Information provided by (Responsible Party):
Dr. Sam Wiebe, University of Calgary

Brief Summary:
The primary goal is to determine whether hippocampal electrical stimulation (HS) is safe and more effective than simply implanting an electrode in the hippocampus without electrical stimulation (HI), in patients with mesial temporal lobe epilepsy (MTLE). This will be assessed by the rate of complex partial seizures per person-month over 6 months of follow-up in HS vs. HI. There are two treatment arms: 1) Hippocampal Electrode Implantation with Stimulation (HS). 2) Hippocampal Electrode Implantation without stimulation (HI). The investigators expect to demonstrate that HS is safe and superior to HI in controlling seizures in patients with MTLE.

Condition or disease Intervention/treatment Phase
Temporal Lobe Epilepsy Procedure: Hippocampal Electrical Stimulation Phase 3

Detailed Description:

This is a multicentre, parallel-group, double blind randomized controlled trial involving patients with MTLE who may be candidates for resective surgery or whose memory function precludes resective surgery. Eligible patients will be randomized in a 2:1 ratio into hippocampal electrode implantation with stimulation (HS), or hippocampal electrode implantation without stimulation (HI). Patients will be followed for seven months after randomization. One month will be devoted to adjustment of interventions, and 6 months to follow-up and outcome assessment. At the end of seven months, all patients will be offered the option of HS, electrode removal, surgical therapy or medical therapy, based on best evidence and patient preference.

Primary Question: In patients with MTLE, over a 6-month period:

Is continuous HS plus medical therapy (MT) more efficacious than hippocampal implantation (HI) plus MT in reducing seizure frequency?

Secondary Questions: In patients with MTLE, over a 6-month period:

  1. Is HS safe?
  2. What is the effect of HS on cognition, mood, and quality of life?
  3. What is the effect of HS on psychiatric morbidity?
  4. Is the efficacy of HS associated with the presence, location and amount of interictal hippocampal spikes on depth electrode recordings?

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 8 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Medical vs Electrical Therapy for Temporal Lobe Epilepsy
Study Start Date : January 2008
Actual Primary Completion Date : March 2012
Actual Study Completion Date : March 2012

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Epilepsy Seizures

Arm Intervention/treatment
Experimental: Hippocampal Stimulation
Hippocampal Stimulation (Stimulator is turned ON) Surgical Intervention
Procedure: Hippocampal Electrical Stimulation
Surgical Implantation of electrode and stimulator

Sham Comparator: Hippocampal Implantation
Hippocampal Implantation (Stimulator is turned OFF)Surgical Intervention
Procedure: Hippocampal Electrical Stimulation
Surgical Implantation of electrode and stimulator

Primary Outcome Measures :
  1. Rate of complex partial seizures (with or without secondary generalization) per person-month over 6 months of follow-up. [ Time Frame: Months 1-7 ]

Secondary Outcome Measures :
  1. Cognitive function: Change in mean scores from baseline to end of study. [ Time Frame: Months 1-7 ]

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Unilateral or Bilateral Mesial Temporal lobe Epilepsy.
  • Age ≥ 18 years.
  • Global IQ ≥70.
  • Failure of ≥ 2 AEDs approved for treatment of partial seizures, used alone or in combination at recommended dosages.
  • Average ≥ 3 seizure-days per month in prior 6 months during which disabling seizures occurred. Disabling seizures are defined as complex partial seizures with or without secondary generalization, or as simple partial seizures that are noticeable by others or interfere with function.
  • Ability to complete self-administered questionnaires.
  • Availability of reliable collateral historian or witness.
  • Patient preference for non-resective surgery, or not a candidate for mesial temporal resection.
  • Give written informed consent.

Exclusion Criteria:

  • Extratemporal or multifocal epilepsy.
  • MRI evidence of potentially epileptogenic lesions outside the mesial temporal region.
  • Lesions precluding electrode implantation (eg, vascular malformations, vascular tumors).
  • Severe hippocampal sclerosis that in the surgeon's opinion precludes accurate electrode placement.
  • Brain lesions that demand prompt surgical therapy (eg, malignant tumors, vascular malformations).
  • Progressive neurological disorders (eg, malignant tumor, dementia, degenerative disorders).
  • Medical or psychiatric conditions precluding surgery or interfering with adherence to treatment and follow-up.
  • Planned pregnancy during the study. Women of child-bearing age will require a negative pregnancy test and adequate contraception methods.
  • Ongoing or planned participation in other studies of new epilepsy therapies.
  • Contraindication for stereotactic surgery, e.g. bleeding diathesis, anticoagulants, treatment with valproate at the time of surgery (risk of bleeding).
  • Any condition that would make participation in the trial detrimental to the patient's health.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00717431

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Canada, Alberta
Foothills Medical Centre, Clinical Neurosciences
Calgary, Alberta, Canada
Sponsors and Collaborators
University of Calgary
University of Western Ontario, Canada
University of Toronto
Dalhousie University
University of Alberta
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Principal Investigator: Samuel Wiebe, MD University of Calgary
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Responsible Party: Dr. Sam Wiebe, Professor, University of Calgary Identifier: NCT00717431    
Other Study ID Numbers: 20492
First Posted: July 17, 2008    Key Record Dates
Last Update Posted: April 2, 2012
Last Verified: March 2012
Keywords provided by Dr. Sam Wiebe, University of Calgary:
Deep Brain Stimulation
Additional relevant MeSH terms:
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Epilepsy, Temporal Lobe
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Epilepsies, Partial
Epileptic Syndromes