Exploring the Attitudes, Barriers, Concerns, Differences, and Ethics (ABCDEs) of Healthcare Decision Making in Prospective Peripheral Indications for Vagus Nerve Stimulation Patients

University Of Minnesota, Minneapolis MN

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Abstract

The NIH Stimulating Peripheral Activity to Relieve Conditions (SPARC-V) initiative will primarily focus on cervical vagus nerve stimulation (VNS). Despite VNS achieving its first Food and Drug Administration (FDA) clearance in 2001 in drug resistant epilepsy and a second indication in difficult to treat depression in 2005, VNS has made minimal public health impacts. Over 125,000 individuals are utilizing clinical VNS. This relatively low uptake in proportion to the size of the population eligible for VNS suggests patients perceive VNS poorly or have unaddressed ethical concerns regarding this technology. VNS is a unique form of invasive neuromodulation requiring a VNS therapy pulse generator to be surgically implanted in the chest wall and a tunneled electrode that delivers intermittent electrical stimulation to the vagus nerve. VNS differs from other forms of electrical neuromodulation uniquely in its invasiveness. Compared to electroconvulsive therapy (ECT) and deep brain stimulation (DBS) in that it indirectly affects the brain through a cranial nerve rather than cortical stimulation so it does not require craniotomy like the latter. Additionally, adequate VNS therapy response is delayed compared to other forms of electrical neuromodulation with ECT inducing response in the order of 1 mo and DBS inducing motor response as early as the same day of device activation. The protracted response trajectory generates ethical issues in neuromodulation particular to this technology deserving of further consideration in order to understand VNS healthcare decision making. REVEAL/SPARC-V offers a unique opportunity to observe a large population anticipating implantation with VNS. The study will recruit adults seeking VNS therapy for both epilepsy and difficult to treat depression and observe them after implantation to characterize VNS’s effects on peripheral systems such as the cardiovascular, immunologic or metabolic systems in addition to their clinical response. These patients offer a unique opportunity to characterize previously unexamined ethical issues and perceptions of VNS while the technology is poised to be developed for additional peripheral indications. We propose a mixed-methods evaluation to characterize VNS specific ethical factors that can impact VNS acceptability for its current indications and to proactively assess these factors for emerging indications in peripheral disease states. After a series of development focus groups a semi structured interview phase assess VNS ethical considerations in depression, epilepsy and prospective peripheral indications in groups of physicians, patients and their caregivers and perform thematic analysis. Additionally, we will use survey methods to assess perceptions of stigma, acceptability, risks,benefits,invasiveness, and barriers to care (defined as medical decision metrics). This work will crucially contribute to the under-examined ethics of VNS. Our proposal will set the stage for better adoption of VNS for both central nervous system illnesses and peripheral organ diseases.