Clinical trial NCT02235792: High Frequency Oscillations in Neurologic Disease
Official title: Chronically-recorded Deep Brain Nuclei/Hippocampal High Frequency Oscillations (HFOs) as Biomarkers of Neurologic Disease.
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: PHASE1
Conditions: Parkinson
Epilepsy
Lead sponsor: Mayo Clinic
Sponsor class: OTHER
First posted: 2014-09-10
Enrollment: 7
Sex: ALL
Minimum age (years): 18
Maximum age (years): 75
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: NA
Intervention model: SINGLE_GROUP
Primary purpose: TREATMENT

Brief summary: This study is designed to evaluate the high-frequency range deep brain oscillations (HFO) as pathologic markers in patients undergoing deep brain stimulation for epilepsy or Parkinson disease. Newly developed technology allows for the chronic recording of these brain signals at the same time as clinical stimulation is occuring. We will learn both whether these HFO correlate with disease activity and whether the HFO change in response to ongoing stimulation (potentially giving insight into the underlying mechanism of action of DBS).

Detailed description: This study is designed to evaluate the high-frequency range deep brain oscillations (HFO) as pathologic markers in patients undergoing deep brain stimulation for epilepsy or Parkinson disease. Newly developed technology allows for the chronic recording of these brain signals at the same time as clinical stimulation is occuring. We will learn both whether these HFO correlate with disease activity and whether the HFO change in response to ongoing stimulation (potentially giving insight into the underlying mechanism of action of DBS). Study participants will undergo DBS in the same way as is usually done but will receive this newer battery with ability to record brain signals.

Eligibility criteria: Inclusion criteria:

1. Medically-refractory neurologic disease amenable to therapy with deep brain stimulation including:

   1. Idiopathic Parkinson disease with motor fluctuation, dyskinesia, and/or medically refractory tremor despite optimal medical management by a movement disorders neurologist.

      OR
   2. Unilateral or bilateral mesial temporal lobe (hippocampal) epilepsy with complex partial, and/or secondarily generalized seizures, that is:

      * confirmed through a combination of interictal scalp EEG, ictal scalp EEG under video monitoring, ictal SPECT scanning, and/or invasive EEG monitoring
      * disabling seizure counts \>2 per month documented over a 3 month period
      * refractory to at least three antiepileptic drugs given at clinically appropriate maintenance doses resulting in therapeutic plasma levels (in cases where such levels have been established for that particular drug. Drug failures because of side- effects will not be counted toward this total.
      * determined to have mesial temporal lobe epilepsy that is not amenable to resective surgery according to consensus opinion among epileptologists on our institution's multidisciplinary Epilepsy Surgery Committee
2. Mayo Clinic Deep Brain Stimulation Committee approval for bilateral deep brain stimulation therapy obtained on routine clinical grounds and without reference to this protocol.
3. Age 18 to 75.
4. Ability and willingness to provide informed consent and participate in the study protocol.

Exclusion criteria:

1. Diagnoses other than those included in #1 above.
2. Comorbid nonepileptic behavioral events or psychogenic movement disorder.
3. Medical contraindications to DBS surgery.
4. Psychiatric comorbidities not under stable medical therapy.
5. Neurodegenerative dementia (cognitive dysfunction resulting from frequent seizure activity will not be an exclusion criteria).
6. Implanted electronically active medical device with the potential to interfere with intracranial recordings (ex. pacemaker, automatic implantable cardioverter defibrillator (AICD), active vagal nerve stimulator).
7. Pregnancy; women of child-bearing potential will be required to commit to using an effective method of contraception during the entire duration of the trial. If a subject becomes pregnant despite these precautions, she will be required to report that to our center within two weeks at which point explantation of the experimental device would be an option.

Primary outcomes:
measure: Degree of correlation of recorded neural signatures with disease severity as determined by regression analysis
timeFrame: 26 weeks post deep brain stimulator implantation
Secondary outcomes:
Other outcomes:
Locations:
city: Rochester
country: United States
facility: Mayo Clinic in Rochester
state: Minnesota
Study officials:
affiliation: Mayo Clinic
name: Bryan Klassen, MD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Van Gompel JJ, Klassen BT, Worrell GA, Lee KH, Shin C, Zhao CZ, Brown DA, Goerss SJ, Kall BA, Stead M. Anterior nuclear deep brain stimulation guided by concordant hippocampal recording. Neurosurg Focus. 2015 Jun;38(6):E9. doi: 10.3171/2015.3.FOCUS1541.