ABSTRACT
Symposium title: Addressing chronic pain and the opioid epidemic using auricular neuromodulation Symposium description: Our proposed symposium integrates a diverse group of scientist and clinician experts (Drs. Cunningham, Wilkes, Khodaparast, Badran) who have committed to exploring the anti-nociceptive and opioid sparing effects of auricular neuromodulation to progress toward non-opioid interventions for chronic pain and opioid use disorders. The demand for chronic pain therapies has increased at an unprecedented rate over the last several decades, contributing in part to a surge in prescription and illicit opioid demand. Countless patients were escalated to prolonged, high-dose opioid regimens over years of treatment. By 2014, 5.4% of U.S. adults were estimated to use prescription opioids on a long-term basis. As the harms of opioid proliferation became increasingly clear, a dramatic paradigm shift occurred in which these drugs are now perceived as more dangerous than beneficial for chronic pain. New clinical guidelines highlight the risks of high-dose regimens as well as the limited benefits, particularly insufficient analgesia and hyperalgesia, associated with long-term use. According to this new perspective, the preferred therapeutic modality for many patients is to safely taper, or even completely stop, using opioids. Transcutaneous auricular neurostimulation (tAN) is a novel therapeutic paradigm that includes stimulation of both the auricular branch of the vagus nerve and auriculotemporal nerve (branch of trigeminal). tAN therapy results in clinically significant reductions in opioid withdrawal symptoms associated with opioid detoxification and tapering. Either adjunctive vagal or trigeminal stimulation modulates pain transmission suggesting overlapping common effector pathways, possibly targeting the endogenous opioid system, which could lead to a synergistic therapeutic benefit for pain. This symposium will explore the scientific basis for this hypothesis across targeted and interconnected topics, including fundamental neuropharmacological mechanisms underlying pain and opioids, clinical challenges of tapering opioids, managing opioid withdrawal symptoms with tAN, and the prospects for tAN to deliver a safe alternative treatment option for pain disorders. The United States is experiencing an epidemic for prescription and non-prescription opioids, which have continued to rise since the 1990s. During 2015, approximately 2.1 million people were severely dependent on prescription opioids, and 513,000 on heroin. In 2020, the Centers for Disease Control reported 93,331 substance use overdose deaths. The continuing increase in opioid-related deaths from 2015 (18%) to 2020 (60%) is partly attributed to the mental health crisis during the Covid-19 pandemic. Aside from pain mitigation, individuals with opioid use disorder (OUD) may be motivated to continue drug-seeking by both the positive reinforcement of the euphoric effects of opioids and the negative reinforcement of opioid withdrawal symptoms due to cessation. Alternative approaches for OUD are a major priority for government agencies given the substantial impact on health, social, and economic welfare. Transcutaneous auricular neurostimulation (tAN) is a non-invasive form of vagus and trigeminal neuromodulation that was recently proven to be an efficacious non-pharmacologic based treatment for reducing opioid withdrawal symptoms. In 2021, tAN therapy received FDA clearance as an adjunctive treatment for opioid withdrawal symptoms in adults. tAN therapy was also proven safe and effective in reducing symptoms of neonatal opioid withdrawal syndrome (NOWS) in neonates. tAN as an adjuvant was safe, well-tolerated, while facilitating the successful rapid weaning of oral morphine and decreasing length of stay in the neonatal ICU. Based on these preliminary findings, tAN therapy is currently in two NIH-funded pivotal clinical trials to: 1) evaluate the long-term effects of tAN on opioid use relapse prevention and cravings in adults with OUD, and 2) determine f tAN therapy can reduce withdrawal symptoms and reduce morphine length of treatment for neonates with NOWS. Lastly, we will explore how tAN could be utilized as neuromodulatory approach for opioid sparing, and ultimately pain mitigation. Research Category and Technology and Methods Clinical Research: 12. Vagus Nerve Stimulation (VNS) Keywords: Vagus Nerve Stimulation, Opioid Use Disorder, Pain, NeurostimulationCopyright © 2023