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CASE REPORT: Reversal of Chronic Autonomic Dysfunction with Transcutaneous Vagus Nerve Stimulation (tVNS)


The human brain can repair neuronal damage after injury from a wide variety of common traumas (physical, emotional, inflammatory, and toxic).1,2

Traumatic brain injury (TBI) commonly disrupts autonomic function 3,4 and is the source of many TBI-related symptoms (lightheadedness, headaches, anxiety, poor cognition).

The ability to recover from TBI is inconsistent. A TBI in one person results in temporary symptoms that fully resolve within weeks to months while an identical injury in another individual may causes symptom that never fully resolve.

Primed-microglia impair the recovery process 5 and results in a process called cumulative brain injury or CBI.


Treatment and autonomic monitoring were performed as part of routine care at Nemechek Autonomic Medicine, a clinic specializing in the treatment of autonomic disorders.

76 subjects (48% male, 52% female, average age – 64 y/o, aver. BMI 34.3) underwent autonomic spectral analysis (ANX 3.0, ANSAR) as part of their routine care for autonomic dysfunction. Subjects were included for analysis according to inclusion and exclusion criteria.

All subjects were started on the Nemechek Protocol, a regimen designed to normalize brain recovery mechanisms though shifting of microglia to the M2-phenotypes and/or suppression of systemic pro-inflammatory cytokines.

Inclusion Criteria

Documented autonomic assessment at baseline and repeat assessment within 2-4 month’s after initiation of the Nemechek Protocol.

Exclusion Criteria

Documentation of complete non-adherence to any single aspect of treatment regimen.

The Nemechek Protocol consists of:

  • tVNS (5 Hz, 250 uS, 1 mA, continuous), 2-4 hours (cumulative time on device), patient-administered via the tragus or concha) daily

  • Rifaximin, 550 mg twice daily x 10 days

  •  Fish Oil containing 3,000 mg of DHA and 1,500 mg of EPA daily

  • 30 ml of EVOO containing an estimated 8 grams of oleic acid daily

  • 1/4 cup of nuts, 1 tbsp. of ground flax or 1,000 mg flax oil capsule daily.


Autonomic assessments were performed via spectral analysis (ANSAR Inc., ANX 3.0) every 2-3 months as part of routine management of the patient.


Recovery of autonomic function at resting and during dynamic testing was demonstrated after 4-6 months of treatment with the Nemechek Protocol.

Significant improvement of heart rate variability (HRV) was noted with increases in the average resting Parasympathetic (RFa) responses (Δ=1.34 bpm2, p=0.05), and average resting Sympathetic (LFa) responses (Δ=2.34 bpm2, P=0.01).

Sympathovagal balance (LFa/RFa) responses increased, but not significantly (Δ=0.95 bpm2, P=0.33).

LFa – Sympathetic response, RFa – Parasympathetic response, Ortho – 5-minute stand test * Indicates P-value is less than 0.05.

Improvements in dynamic autonomic function were observed including a decrease of abnormal, excessive parasympathetic responses during Valsalva (48.6% reduction, P=0.01) and during 5-minute postural challenge. (32.9% reduction, P=0.01).

Dynamic sympathetic responses showed non-significant declines with Valsalva (Δ=-2.12 bpm2, P=0.76), and 5-minute postural challenge (Δ=-0.26 bpm2, P=0.63). Improvement in dynamic sympathetic function is commonly obscured with improvements in parasympathetic
excess states.

Time domain indices all showed positive trends but failed to meet significance; sdNN (Δ=+40.4, P=0.16), rmsDD (Δ=+31.4, P=0.14), pNN50 (Δ=+10.7, P=0.37).












Utilizing transcutaneous vagus nerve stimulation, the Nemechek Protocol reverse chronic autonomic dysfunction within 2-4 months.

Improved resting heart rate variability and dynamic parasympathetic function during Valsalva and 5-minute orthostatic challenged were observed.

Improvement of symptoms such as lightheaded or dizzy sensations, headaches, chronic fatigue, anxiety and poor memory or concentration improved in parallel with autonomic recovery (data not shown).

Complete recovery of ANS function and symptom resolution were often seen in patients after 8-12 months of treatment with the Nemechek Protocol.


Brain injury can occur from physical, emotional and inflammatory injuries, and should be repaired within a few weeks to months if normal brain repair mechanisms are functioning. 1,2,5

Impairment of the neuron recovery process leads to residual damage due to the combined effect of primed-microglia from bacterial overgrowth magnify neuronal damage and excessive pro-inflammatory cytokines.6,7,8

Vagus nerve stimulation shifts microglia phenotype from M1 inflammatory type to the M2 anti-inflammatory types, suppresses systemic cytokine levels and induces neuroplasticity.11, 12, 19

Primed M1-microglia magnify neuronal damage and repair recovery resulting in cumulative brain injury (CBI).

Cumulative brain injury occurs when residual damage accumulates with each injury, and can be detected with spectral analysis of the autonomic nervous system.

tVNS is simple and inexpensive, and when used as part of the Nemechek Protocol can reverse symptoms of Alzheimer’s dementia17 and combat-associated PTSD18.

The Nemechek Protocol may prove effective for many other chronic medical conditions (Parkinson’s, ALS, macular degeneration, essential tremor, generalized anxiety, ADD, autism, depression, fatigue, migraine headaches, cancer, cardiovascular disease) are associated with microglia dysfunction and elevated pro-inflammatory cytokines.


1. Wager-Smith, Karen, and Athina Markou. “Depression: A Repair Response to Stress-Induced Neuronal Microdamage That Can Grade into a Chronic Neuroinflammatory Condition?” Neuroscience and biobehavioral reviews 35.3 (2011): 742–764.

2. Sun, Rao et al. “Hippocampal Activation of Microglia May Underlie the Shared Neurobiology of Comorbid Posttraumatic Stress Disorder and Chronic Pain.” Molecular Pain 12 (2016): 1744806916679166.

3. Goodman, Brent et al. “Autonomic Nervous System Dysfunction in Concussion.” Neurology February 12, 2013 vol. 80 no. 7 Supplement P01.265

4. La Fountaine, Michael F. et al. “Autonomic Nervous System Responses to Concussion: Arterial Pulse Contour Analysis.” Frontiers in Neurology 7 (2016): 13.

5. Cunningham, Colm. “Microglia and neurodegeneration: the role of systemic inflammation.” J Neurosci. 2013 Mar 6;33(10):4216-33.

6. Norden, Diana M., Megan M. Muccigrosso, and Jonathan P. Godbout. “Microglial Priming and Enhanced Reactivity to Secondary Insult in Aging, and Traumatic CNS Injury, and Neurodegenerative Disease.” Neuropharmacology 96.0 0 (2015): 29–41.

7. Calabrese, Francesca et al. “Brain-Derived Neurotrophic Factor: A Bridge between Inflammation and Neuroplasticity.” Frontiers in Cellular Neuroscience 8 (2014): 430.

8. Cunningham, Colm. “Systemic Inflammation and Delirium – Important Co-Factors in the Progression of Dementia.” Biochemical Society transactions 39.4 (2011): 945–953.

9. Goodman et al. “Autonomic Nervous System Dysfunction in Concussion.” Neurology 80 (1001): P01.265

10. McCraty, Rollin, and Fred Shaffer. “Heart Rate Variability: New Perspectives on Physiological Mechanisms, Assessment of Self-Regulatory Capacity, and Health Risk.” Global Advances in Health and Medicine 4.1 (2015): 46–61. PMC.

11. Zhang Q et al. “Activation of the α7 nicotinic receptor promotes lipopolysaccharide-induced conversion of M1 microglia to M2.” Am J Transl Res 2017;9(3):971-985.

12. Meneses, G. et al. “Electric Stimulation of the Vagus Nerve Reduced Mouse Neuroinflammation Induced by Lipopolysaccharide.” Journal of Inflammation (London, England) 13 (2016): 33.

13. Chang, Philip K-Y et al. “Docosahexaenoic Acid (DHA): A Modulator of Microglia Activity and Dendritic Spine Morphology.” Journal of Neuroinflammation 12 (2015): 34.

14. Harvey, Lloyd D. et al. “Administration of DHA Reduces Endoplasmic Reticulum Stress-Associated Inflammation and Alters Microglial or Macrophage Activation in Traumatic Brain Injury.” ASN NEURO 7.6 (2015): 1759091415618969.

15. Liu, Joanne J. et al. “Pathways of Polyunsaturated Fatty Acid Utilization: Implications for Brain Function in Neuropsychiatric Health and Disease.” Brain research 0 (2015): 220–246.

16. Gao J et al. “Rifaximin, gut microbes and mucosal inflammation: unraveling a complex relationship.” Gut Microbes. 2014 Jul 1;5(4):571-5.

17. Nemechek, Patrick and Nemechek, Jean. “Case Study: Reversal of Alzheimer’s Dementia with Transcutaneous Vagus Nerve Stimulation (tVNS) in Combination with an Anti-Neuroinflammatory Regimen”. International Neuromodulation Society’s 13th World Congress, May 2017. Abstract ID: 2718955

18. Nemechek, Patrick and Nemechek, Jean. “Reversal of PTSD with Transcutaneous Vagus Nerve Stimulation (tVNS) in Combination with an Anti-Neuroinflammatory Regimen”. International Neuromodulation Society’s 13th World Congress. May 2017. Abstract ID: 2719545

19. M. S., Borland et al. “Cortical Map Plasticity as a Function of Vagus Nerve Stimulation Intensity.” Brain stimulation 9.1 (2016): 117–123.

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