RESEARCH EVALUATING VAGAL EXCITATION AND ANATOMICAL LINKS
University of Minnesota
Summary
The acute and chronic effects of VNS stimulation on various on the autonomic nervous, cardiovascular, immune, and metabolic systems will be compared from noninvasive and minimally invasive physiological recordings and blood draws at various time points throughout the study. These interventions and assessments will be performed in individuals 18 years of age and older who are implanted with a VNS device, which consists of patients who have been diagnosed with drug resistant epilepsy or major depressive disorder. The REVEAL study is not a treatment study; its primary objective is to scientifically investigate the contributing roles of efferent versus afferent vagus nerve modulation of multiple peripheral organs and their dependence on stimulation parameters, in which participants are those who have been implanted with a VNS device be receive standard of care treatment for their epilepsy or depressive disorder.
Eligibility
- Age range
- 18+ years
- Sex
- All
- Healthy volunteers
- No
Inclusion Criteria: Cohort 1a (p-VNS): Inclusion Criteria for Participants With Major Depressive Disorder That Have a Previously Implanted VNS Device * Participant must be at least 18 years old. * Participant must have the capacity to provide written informed consent and Health Insurance Portability and Accountability Act (HIPAA) authorization. * Participant must be enrolled in an active health insurance plan that will cover the costs associated with standard health care services and injuries. * Participant must have been previously implanted with a VNS device for the clinical indication of…
Interventions
- DeviceVagus nerve stimulation device: acute and chronic administration of investigational vagus nerve stimulation parameters
Duty cycle: At Visit 1, while the frequencies are being changed over Period 1, 2, and 3, duty cycle will be held constant at the participant's randomly assigned first duty cycle setting. At Visit 2, duty cycle will be held constant at the participant's randomly assigned second duty cycle setting. At Visit 2 the participant will receive whichever duty cycle they were not randomly assigned at Visit 1. Therefore, by completing the combination of three frequencies at two duty cycles, each participant will have received all six possible VNS parameter combinations over the two study visits. Chronic period: The VNS setting for the Chronic Period in between Visit 1 and Visit 2 will be the same settings as tested during Visit 1 Period 3. Since Visit 1 Period 3 settings were already randomly assigned to each participant, another randomization for the chronic period is not needed.
Locations (7)
- Stanford UniversityStanford, California
- University of MinnesotaMinneapolis, Minnesota
- Washington University in St. LouisSt Louis, Missouri
- Alivation Research, LLCLincoln, Nebraska
- Medical University of South CarolinaCharleston, South Carolina
- Alfred HealthMelbourne, Victoria