Closed Loop DBS Implanted RC+S Study

Dennis Turner, M.D.

Status: Active, not recruiting

Conditions: Parkinson Disease

Treatments: Device: STN alone; Device: STN + GPi; Device: GPi alone; Device: Closed-loop stimulation

Study type: Interventional

Funder types: Other; NIH

Identifiers

NCT03815656

Pro00100982

UH3NS129898 (U.S. NIH Grant/Contract)

UH3NS103468 (U.S. NIH Grant/Contract)

Details and patient eligibility

About

This study involves patients who are already planning to have deep brain stimulation (DBS) surgery to treat the symptoms of severe Parkinson's Disease (PD). The study has two goals:

1. to evaluate the effectiveness of implanting DBS electrodes in the two most common locations for DBS (subthalamic nucleus (STN), and globus pallidus interna (GPi)), instead of just one electrode, on each side of the brain; and
2. to develop an adaptive DBS system using brain signals measured from these two electrodes.

Full description

The purpose of this study is a small, first in man, clinical feasibility trial for patients with severe Parkinson's Disease (PD), who are already clinically eligible for deep brain stimulation (DBS) with two goals:

1. to compare efficacy from two common sites of DBS (subthalamic nucleus (STN), and globus pallidus interna (GPi)) through the implantation of dual DBS electrodes on each side of the brain; and
2. to develop a closed loop DBS system using evoked and spontaneous potentials derived from these two electrodes.

The study will involve bilateral dual DBS electrode placement in clinically standard locations (ie, STN and GPi) unilaterally or (more often) bilaterally, the placement of the RC+S Medtronic research implantable pulse generator (IPG), and a commitment to return for both extensive postoperative programming and testing to define clinical efficacy and separate research days to develop the closed loop approach. In addition, patients will undergo intraoperative research using temporary percutaneous extensions to the DBS electrode(s) and DBS lead cannula after implantation to confirm the electrode location and to identify what the signals will look like during later chronic recordings through the research IPG.

The research RC+S IPG includes both ordinary DBS stimulation as well as a recording system that simultaneously measures the DBS local evoked potential (DLEP) and/or local field potential (LFP) responses from either the same or a second DBS electrode.

Enrollment: 6 patients

Sex: All

Ages: 18 to 75 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• able to give informed consent
• diagnosed with Parkinson's Disease and is considered a surgical candidate for DBS
• has medication-related side effects from levodopa (i.e., dyskinesias, on-off fluctuations)
• has off-on improvement with levodopa of at least 30%
• is available for follow-up visits for length of study

Exclusion criteria

• is not safe surgical candidate for DBS
• has severe neurological injury or disease other than Parkinson's Disease
• has condition requiring repeated MRI scans
• has untreated, clinically significant depression
• has an electrical or electromagnetic implant
• had a prior thalamotomy or surgical ablation procedure
• has dementia interfering with ability to comply with study requirements or give informed consent
• abuses drugs or alcohol
• has a history of seizures
• has any metallic implants
• is pregnant

Trial design

Primary purpose: Treatment

Allocation: N/A

Interventional model: Single Group Assignment

Masking: None (Open label)

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6 participants in 1 patient group

Implanted RC+S

Experimental group

Description:

Implanted Medtronic RC+S IPG with dual DBS electrodes in STN and GPi. DBS stimulation will be administered to: 1) STN alone, 2) GPi alone, 3) cooperative STN + GPi, and 4) adaptive, closed-loop stimulation of STN and/or GPi.

Treatment:

Device: Closed-loop stimulation

Device: GPi alone

Device: STN + GPi

Device: STN alone