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Vagus Nerve Stimulation As an Adjunctive Neurostimulation Tool in Treatment-resistant Depression

Vagus Nerve Stimulation As an Adjunctive Neurostimulation Tool in Treatment-resistant Depression

Published on: January 7, 2019

Vagus nerve stimulation therapy for seizures.

Ramachandran Ramani¹

¹Department of Anesthesia, Yale University School of Medicine, New Haven, CT 06520-8051, USA. ramachandran.ramani@yale.edu

Journal of Neurosurgical Anesthesiology

|December 25, 2007

Summary

Vagus nerve stimulation (VNS) is an effective non-drug therapy for reducing seizure frequency in patients with epilepsy refractory to medication. This therapy offers significant seizure reduction and mood improvement with generally tolerable side effects.

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Area of Science:

Neurology
Neurosurgery
Medical Devices

Background:

Epilepsy affects millions, with a significant portion experiencing medically refractory seizures.
Surgical options are limited for many patients with refractory epilepsy.
Vagus nerve stimulation (VNS) presents a non-pharmacologic therapeutic alternative.

Purpose of the Study:

To evaluate the efficacy and safety of Vagus Nerve Stimulation (VNS) as a treatment for medically refractory partial onset seizures.
To explore the mechanism of action and patient outcomes associated with VNS therapy.

Main Methods:

VNS involves implanting a device with electrodes on the left vagus nerve and a generator in the chest.
The left vagus nerve is preferred due to cardiac implications of stimulating the right vagus nerve.
Laboratory studies suggest VNS increases norepinephrine release, raising the seizure threshold.

Main Results:

Class I evidence confirms VNS reduces seizure frequency.
Studies show a 50% reduction in seizure frequency, with sustained effects over multiple years (37% first year, 44% second/third year).
VNS therapy also demonstrates mood elevation independent of seizure control.

Conclusions:

Vagus nerve stimulation is an effective non-pharmacologic treatment for medically refractory partial onset seizures.
Common side effects include throat constriction, voice alteration, and pain, which are typically manageable.
VNS offers a viable therapeutic option for patients unresponsive to anti-epileptic drugs.