PTSD Clinical Trial
Official title:
Non-Invasive Vagal Nerve Stimulation in Veterans With Mild Traumatic Brain Injury (mTBI)
Mild traumatic brain injury (mTBI) and posttraumatic stress disorder (PTSD) are important conditions for the Veterans Administration (VA) that frequently occur together in combat Veterans from the conflicts in Afghanistan and Iraq. In many Veterans these become chronic, raising the risk the burden of neurotrauma can worsen over time. This study will examine a new intervention called non-invasive Vagal Nerve Stimulation (nVNS) and its effects on memory and symptoms of PTSD and mTBI as well as brain and physiology in Veterans with mTBI and PTSD.
This projects will assess the effects of non-invasive Vagal Nerve Stimulation (nVNS) on neurobiology and cognition in combat Veterans with mild Traumatic Brain Injury (mTBI) and co-morbid posttraumatic stress disorder (PTSD) during the performance of stressful tasks (traumatic scripts, mental arithmetic) and verbal declarative memory tasks using measurement of memory performance, peripheral inflammatory markers in blood (IL6) and cardiovascular responses using wearable gated sensing devices and electro- and seismocardiography, as well as brain response (anterior cingulate, hippocampus) measured with High Resolution Positron Emission Tomography (HR-PET) and radiolabelled water (15O[H2O]). The investigators hypothesize that nVNS but not sham control will result in enhanced memory, and hippocampal activation with memory encoding, and reduced cardiovascular, sympathetic, and inflammatory responses to stress. The investigators will also assess the effects of nVNS and sham on memory retention when applied to the encoding phase of a declarative memory learning task repeated daily over a four day period and on ratings of PTSD and pain in Veterans with mTBI and co-morbid PTSD and repeat assessments after three months of twice daily treatments. ;
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