Vagus nerve stimulation (VNS) is a long term, intermittent stimulation of the left vagus nerve (a major nerve originating from the brain) by a device. It is implanted into the chest wall on the left side (like the pacemaker of the heart). Current is intermittently delivered through a lead wire from the equipment to stimulate the left vagus nerve. Vagus nerve stimulation has been used for the treatment of severe epilepsy and depression.
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