Leveraging Noninvasive Transcutaneous Vagus Nerve Stimulation and Smartphone Technology to Reduce Suicidal Behaviors and Suicide Among Highly Vulnerable Adolescents

PROJECT SUMMARY / ABSTRACT Over the past two decades, suicide rates have increased nearly 35% in the U.S., with up- ward trends in nearly all demographic groups. Further increases have occurred since the COVID-19 pandemic began. Despite ambitious goals for reducing suicides and significant fed- eral and private investment, suicide rates continue to rise unabated. To date, the predominant

approach to mitigating suicide risk in the U.S. is secondary prevention. Typically, these pro- grams identify risk of recurrence among those who have already attempted suicide at least once. Although secondary prevention is crucial, the majority of deaths by suicide occur on first attempt. Thus, targeted primary prevention earlier in development is essential. Most current pri-

mary prevention programs are intensive, expensive, and delivered by highly trained mental health providers, who are in short supply. Traditional face-to-face therapy is also unavailable to many who live in underserved communities, and disliked by adolescents, who much prefer digi- tal delivery on their devices. This high-risk, high-reward proposal addresses these limitations

and needs. We use an experimental therapeutics approach to evaluate the independent and combined efficacies of two unconventional but scalable interventions: transcutaneous vagus nerve stimulation (tVNS) to target emotion dysregulation, and a peer-support smartphone app to combat social isolation. These low-cost interventions, which hold strong promise but have not

been used before, can reach large numbers of adolescents, with much potential to reduce pro- spective suicide risk. We will enroll 212 adolescents, ages 13-17-years, who show elevations on at least two prominent risk factors for suicide (e.g., self-injury, maltreatment). Using a 2 × 2 de- sign, adolescents will be assigned randomly to receive 30 days of treatment with (1) tVNS to tar-

get emotion dysregulation, (2) a peer-support phone app to target social isolation, (3) tVNS + a peer-support phone app, or (4) enhanced treatment as usual with monitoring and access to re- sources. Intervention effects on mechanisms (emotion dysregulation, social isolation) proximal efficacy signals (e.g., physiological reactivity, self-harm) and target outcomes (suicidal ideation,

suicidal behaviors) will be evaluated immediately post-intervention and at one-year follow-up. Treatment data will be monitored daily to fine-tune dosing of both interventions. This transforma- tive and innovative proposal tests two novel, scalable preventive interventions designed to “meet adolescents where they are" by using digital technologies to address core mechanisms of

suicide risk.