Vagus Nerve Stimulation (VNS)
Vagus nerve stimulation (VNS) is an implantable neuromodulation treatment used as add-on therapy for selected patients with drug-resistant epilepsy, especially when seizure reduction is needed and brain resection is not the best option.
Epilepsy surgery pathway
From evaluation to long-term seizure care
Evaluation
Review history, imaging, EEG results, and medication response.
SEEG and mapping
Use video-EEG, imaging, and sEEG when needed to localize where seizures begin, how they spread, and what functions are nearby.
Decision
Choose resection, ablation, neuromodulation, further mapping, or non-surgical care.
Treatment
Carry out the selected procedure with a plan for safety, recovery, and seizure goals.
Follow-up
Track seizure control, medications, recovery, mood, and device settings when needed.
Precision mapping
MRI, video-EEG, neuropsychology, and sEEG when deeper localization is needed.
Tailored treatment
Resection, laser ablation, or neuromodulation selected around seizure anatomy and goals.
Long-term planning
Device programming, follow-up, and medication strategy coordinated with the epilepsy team.
Overview
Vagus nerve stimulation (VNS) is a neuromodulation treatment for selected patients with drug-resistant epilepsy. It uses an implanted device to send regular electrical pulses to the left vagus nerve, which can reduce seizure frequency and severity over time.
VNS does not remove a seizure focus and it does not require electrodes in the brain. It is usually used as an add-on treatment alongside anti-seizure medication, with the goal of reducing seizure burden and improving recovery or quality of life for selected patients.
Who it is for
VNS may be considered when seizures remain uncontrolled despite medication and resective surgery is not appropriate, or when additional seizure reduction is needed. It can be used for a range of seizure patterns depending on the full epilepsy evaluation.
VNS is often discussed when:
- Seizures are drug-resistant but no single safely removable focus has been identified
- Seizures arise from more than one network or from areas that should not be removed
- The patient needs a palliative seizure-reduction strategy rather than curative resection
- RNS, DBS, laser ablation, or resection are not the best match for the seizure pattern
- The goal is fewer seizures, less severe seizures, faster recovery, or improved safety over time
How the procedure works
The VNS device is implanted under the skin in the upper chest and connected to the left vagus nerve in the neck through a small lead. After surgery, the device is activated and stimulation settings are adjusted gradually during follow-up visits.
The procedure does not require a craniotomy or placement of electrodes in the brain. It is typically performed through small incisions in the chest and neck. After healing, the device is programmed to deliver stimulation cycles at regular intervals.
Many patients do not notice the full benefit immediately. Settings are increased over time, and seizure diaries help the care team track seizure frequency, severity, recovery time, mood, alertness, and side effects.
Device management
Patients and caregivers are often given a magnet that can be used to deliver extra stimulation during a warning aura or at the start of a seizure. The magnet can also temporarily pause stimulation in selected situations if instructed by the care team.
Some VNS systems can also deliver additional stimulation when the device detects a heart-rate pattern that may occur around a seizure. This does not replace seizure tracking, but it can add another layer of responsive therapy for selected patients.
Common stimulation side effects can include hoarseness, throat sensation, coughing, voice change, or discomfort during stimulation. MRI and certain procedures require device-specific precautions, so patients should tell other clinicians that they have an implanted VNS system.
Follow-up includes checking the incision sites, confirming the device is working, adjusting stimulation settings, reviewing seizure diaries, and coordinating medication strategy with the epilepsy team. Battery status is monitored over time and generator replacement is planned when needed.
VNS therapy video
Dr. Barone’s approach
Dr. Barone evaluates VNS as part of the full set of epilepsy surgery and neuromodulation options, helping patients understand whether VNS, RNS, DBS, resection, or laser ablation best fits their goals and seizure pattern.
Reference
Frequently asked questions
What is VNS? +
VNS is an implanted device that sends regular electrical pulses to the left vagus nerve in the neck, which can help reduce seizure frequency and severity in some patients over time.
Who may be a candidate for VNS? +
VNS may be considered for patients with drug-resistant epilepsy who are not candidates for resective surgery, who do not have a single safely removable seizure focus, or who need an additional treatment to reduce seizure burden.
Is VNS brain surgery? +
VNS does not involve placing electrodes in the brain. The device is implanted under the skin in the chest and connected to the vagus nerve in the neck.
Does VNS stop seizures immediately? +
VNS benefit usually builds gradually. Stimulation settings are adjusted over follow-up visits, and many patients continue anti-seizure medication while the team tracks seizure frequency, severity, and recovery.
Considering treatment for Vagus nerve stimulation?
Dr. Barone evaluates new patients and referrals at Houston Methodist Hospital, Houston. Patients from outside Houston, across the United States, and internationally are welcome.