Summary
Highlights
Dr. Nick Schmilkolfer introduces the vagus nerve as the 10th cranial nerve, originating from the brain stem and extending throughout the chest and abdomen. It innervates vital organs like the heart, lungs, and gastrointestinal tract, and is involved in taste, hearing sensation from the ear, and speech. The vagus nerve is also known as 'The Wanderer' due to its extensive reach.
Vagus nerve stimulation (VNS) promotes the 'rest and digest' parasympathetic nervous system, which helps reduce inflammation, calm anxiety, and improve mood. This makes VNS beneficial for a wide array of conditions.
Dr. Schmilkolfer references a 2018 paper from the Journal of Inflammation Research, focusing on invasive VNS. This method involves surgically implanting an electrical transducer around the vagus nerve, typically the left one, to send impulses.
VNS is FDA approved for treating drug-resistant epilepsy in patients over 12 years old and depression. Both conditions may benefit from VNS due to its anti-inflammatory properties, particularly in reducing chronic neural inflammation.
The anti-inflammatory effects of VNS show promise for a range of chronic inflammatory disorders including sepsis, lung injury, rheumatoid arthritis, diabetes, fibromyalgia, and migraines. The vagus nerve is 80% sensory, meaning it primarily informs the brain about the body's internal state, such as gut health or inflammation.
The medical diagram illustrates how the vagus nerve brings sensory input from organs to the brainstem and sends motor output back. Invasive VNS generally targets the left vagus nerve to avoid stimulating the heart's sinoatrial node, which could cause arrhythmias. For epilepsy patients, VNS can lead to a 50% reduction in seizures for about 40% of patients after two to three years of treatment. For depression, VNS can increase mood.
VNS has potential applications in cardiovascular disease, arthritis, Alzheimer's disease, sepsis, and conditions requiring pain management. Pain can often be linked to neuroinflammation or neurotransmitter deficiencies. VNS is also beneficial for migraines, obesity due to its link to metabolic syndrome and inflammation, lung injury, diabetes, stroke, and traumatic brain injury (TBI) by decreasing both acute and chronic neuroinflammation.
While the discussed paper focuses on invasive VNS, non-invasive methods (electrical stimulation on the ear or neck) offer similar benefits and are more accessible and cost-effective. At-home methods to stimulate the vagus nerve include meditation, gargling, chanting, singing, and deep breathing exercises where exhalation is longer than inhalation.