Journal
NEUROLOGICAL RESEARCH
Volume 35, Issue 3, Pages 263-276Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1179/1743132813Y.0000000167
Keywords
Clinical trial; Epilepsy; Minimally conscious state; Traumatic brain injury; Vagus nerve stimulation; Vegetative states
Categories
Funding
- Department of Veterans Affairs, Veterans Health Administration Office of Research and Development Rehabilitation Research and Development Service [1I01RX000319-01]
- AOA Carolyn L. Kuckein Medical Student Summer Research Fellowship
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Objectives: Traumatic brain injury (TBI) has high morbidity and mortality in both civilian and military populations. Blast and other mechanisms of TBI damage the brain by causing neurons to disconnect and atrophy. Such traumatic axonal injury can lead to persistent vegetative and minimally conscious states (VS and MCS), for which limited treatment options exist, including physical, occupational, speech, and cognitive therapies. More than 60 000 patients have received vagus nerve stimulation (VNS) for epilepsy and depression. In addition to decreased seizure frequency and severity, patients report enhanced mood, reduced daytime sleepiness independent of seizure control, increased slow wave sleep, and improved cognition, memory, and quality of life. Early stimulation of the vagus nerve accelerates the rate and extent of behavioral and cognitive recovery after fluid percussion brain injury in rats. Methods: We recently obtained Food and Drug Administration (FDA) approval for a pilot prospective randomized crossover trial to demonstrate objective improvement in clinical outcome by placement of a vagus nerve stimulator in patients who are recovering from severe TBI. Our hypothesis is that stimulation of the vagus nerve results in increased cerebral blood flow and metabolism in the forebrain, thalamus, and reticular formation, which promotes arousal and improved consciousness, thereby improving outcome after TBI resulting in MCS or VS. Discussion: If this study demonstrates that VNS can safely and positively impact outcome, then a larger randomized prospective crossover trial will be proposed.
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