Evaluation of Electrical Stimulation During Nerve Transfer Surgery for Cervical Spinal Cord Injury
Stanford University
Summary
The goal of this prospective observational study is to determine whether brief intraoperative electrical stimulation and temporary postoperative electrical stimulation improve motor and/or pain outcomes for patients with cervical spinal cord injury undergoing standard of care nerve transfer surgery to improve hand function. The main hypotheses include: Hypothesis #1: Brief intraoperative electrical stimulation of the donor nerves will result in improved motor outcomes (hand function) compared to standard nerve transfer surgery in patients with cervical spinal cord injuries. Hypothesis #2: Placement of a temporary peripheral nerve stimulator for 60 days of postoperative electrical stimulation will result in improved pain outcomes compared to standard nerve transfer surgery in patients with cervical spinal cord injuries. Researchers will prospectively enroll patients with cervical spinal cord injury and no hand function who will undergo standard of care nerve transfer surgery combined with standard of care brief intraoperative electrical stimulation and temporary postoperative electrical stimulation. Motor and pain outcomes will be compared to a retrospective group of patients who underwent nerve transfer surgery without intraoperative or postoperative electrical stimulation. Participants will receive standard medical care (nothing experimental) as part of this study. Participants will: * Have a preoperative assessment including physical examination, electrodiagnostic studies, functional electrical stimulation, and will complete questionnaires assessing function and quality of life * Agree upon a surgical plan, including the specific nerve transfers to be performed and whether to include brief intraoperative electrical stimulation and/or temporary postoperative electrical stimulation before being considered for enrollment in the study * Will undergo standard of care nerve transfer surgery, with at least one nerve transfer targeting improvement in hand function and will receive brief intraoperative electrical stimulation of the donor nerves and placement of a temporary peripheral nerve stimulator * Will follow-up with the surgeon 3, 6, 12, 24, and 36 months after the surgery * Will have a physical examination and will complete questionnaires at the postoperative visits * Will participate in hand therapy following the operation * Will be eligible for placement of a permanent peripheral nerve stimulator, depending on response to the temporary peripheral nerve stimulator.
Description
Background: Spinal cord injury (SCI) is a major problem facing the general public, with particular relevance for military personnel, given the high frequency of SCI in combat-related injuries. Nerve transfer surgery is one option for restoring function in cervical SCI patients that shows great promise. A nerve transfer involves sacrificing a working nerve that arises from a spinal cord segment above the zone of injury and connecting it to a non-working nerve to reinnervate a target muscle. Restoring hand function is consistently rated by SCI patients, including our lived experience consultant…
Eligibility
- Age range
- 18–65 years
- Sex
- All
- Healthy volunteers
- No
Inclusion Criteria: 1. Cervical spinal cord injury, ASIA A or ASIA B 2. International Standards for Neurological Classification of Spinal Cord Injury neurological level of injury C6 or C7 3. Agreed upon surgical plan includes at least 1 nerve transfer targeting finger flexion with the anterior interosseous nerve as the recipient and at least 1 nerve transfer targeting finger extension with the posterior interosseous nerve as the recipient 4. Age 18-65 years 5. Mentally and physically able to comply with evaluations and assessments 6. Upper motor neuron pattern of injury in the recipient nerve…
Interventions
- DeviceBrief intraoperative electrical stimulation
Intraoperative brief electrical stimulation (BES) will be performed using a handheld nerve stimulator (Checkpoint Guardian) to stimulate the donor nerves at 2 mA with a 200 µs pulse duration for 10 minutes per nerve.
- DeviceTemporary Postoperative Peripheral Nerve Stimulation
An implantable temporary peripheral nerve stimulator (SPRINT PNS System) will be placed during the surgery with one lead for each donor nerve. The implantable peripheral nerve stimulator will be programmed to optimize postoperative pain control on an individualized basis. The peripheral nerve stimulator will be explanted after 60 days, as is intended for this device.
Location
- Stanford University/Stanford Health CarePalo Alto, California