Vagus Nerve Stimulation (VNS): A New Hope for Epilepsy Patients

Patients with epilepsy, particularly those who do not react well to medication, now have new hope because of a groundbreaking procedure called vagus nerve stimulation (VNS). In this procedure, a small device that delivers moderate electrical impulses to the vagus nerve in the neck is implanted beneath the skin of the chest. These regulated signals lessen the frequency, length, and intensity of seizures by assisting in the regulation of brain activity.

VNS is especially advantageous for people who are suffering from drug-resistant epilepsy, providing an effective substitute treatment when medications aren't working. Many patients eventually report more alertness, better seizure control, and an overall improvement in their quality of life. VNS greatly aids in controlling the symptoms of epilepsy and reduces reliance on large dosages of medicine, even if it is not a cure. Due to developments in neurostimulation, this treatment is now a well-received, safe choice that provides epileptics with long-term advantages.

What is Vagus Nerve Stimulation (VNS)?

Vagus nerve is one of twelve pairs of cranial nerves that carry electrical messages from your brain to various areas of your neck, head, and torso. They regulate several functions of your body. The vagus nerve is part of a circuit that connects your neck, heart, lungs, and belly to your brain.

Vagus nerve stimulation (VNS) is a type of neuromodulation therapy that works by modifying the nerve activity. It involves implantation of a device that provides regular, moderate, and tolerable electrical pulses via vagus nerve, present in your neck, to your brainstem. After reaching your brainstem, the electrical charge is dispersed to various points of your brain, altering the way brain cells function. The primary function of vagus nerve stimulation is similar to a pacemaker for your heart. So, VNS is sometimes known as a "pacemaker for the brain."

VNS is an intervention that is often considered if other standard therapies have failed for effectively managing drug-resistant epilepsy or depression. VNS has just been approved as a rehabilitation procedure for specific stroke patients also.

What is the Mode of Action of Vagus Nerve Stimulation (VNS)?

For controlling seizures, VNS helps in:

• Improving blood flow to critical areas of your brain.
• Manage chaos of electrical patterns that occur during a seizure.
• Increase release of neurotransmitters in your brain for better controlling seizure events.

For managing depression, VNS helps in:

• Modifying the concentration of specific neurotransmitters in your brain that are involved in mood regulation.

For stroke rehabilitation, VNS play a great role in:

• Stimulating specific areas of your brain, thereby optimising your ability to move your arms and hands.

What are the Conditions for Which Vagus Nerve Stimulation (VNS) is Indicated?

The Food and Drug Administration (FDA) granted approval for vagus nerve stimulation (VNS) for the treatment of following three medical disorders:

• Epilepsy: VNS has been approved as a secondary treatment for focal (partial) seizures in adults and children aged four and above when other drugs have failed to control their seizures.
• Depression: VNS has been approved for individuals aged 18 and up who have long-term or recurrent (repeating) serious depression and have not responded well to four or more antidepressant therapies.
• Stroke rehabilitation: VNS is authorized as an adjunct to rehabilitation treatment for patients who have had moderate to severe loss of arm and hand function as a result of an ischemic (blocked blood flow) stroke.

How is Vagus Nerve Stimulation (VNS) Performed?

First, your surgeon will make two incisions (cuts), one on your upper left chest and one on the left side of your neck exposing your vagus nerve. Through the incision created in your neck, the coil electrodes at the end of the lead wire are gently wrapped around your left vagus nerve. At the chest incision, your surgeon will then guide the insulated lead cable that runs from the electrodes from your neck down to your chest. After that, your doctor will attach a battery to the electrode's end. The size of the battery is just a bit bigger than a silver dollar. It passes through the incision in your chest and then placed into a pocket surgically formed above your muscle.

After implanting the device, lead wire, and electrodes, the system is tested. The device is often turned on at the lowest setting for 30 to 90 seconds to ensure that it is stimulating your vagus nerve. Your surgeon then performs a system test. Finally, doctors use permanent stitches (sutures) to attach the device to your body. The procedure usually takes 45 to 90 minutes to complete.

What Patient is Advised to do After Vagus Nerve Stimulation (VNS)?

Following are the follow up recommendation advised by your surgeon:

• Regular Follow-ups: Evaluation and alteration the stimulation levels on a regular basis, based on the effectiveness of seizure management and patient response.
• Device Programming: External programming of implanted VNS device with a wand and software for more personalization.
• Use of Handheld Magnet: The doctor will give you a hand-held magnet to manually turn on or off the stimulator during a seizure.
• Battery Monitoring: After three to ten years, the device's battery has to be checked and eventually replaced with minimal surgery.
• Symptom Monitoring: Keep an eye out for adverse effects that could necessitate setting modifications, such as changes in voice, coughing, sore throats, or breathing problems.
• Routine Check-ups: Regular neurologist visits ensure that the device is working effectively for efficient seizure management.

Conclusion

With vagus nerve stimulation (VNS), your vagus nerve receives electrical pulses of moderate frequency from the VNS device that is implanted in your neck. The pulses then make their way to your brain. Ask your doctor if VNS is an effective treatment option if you suffer depression, difficult focal seizures, or restricted upper arm motion after a stroke.

Discover how Vagus Nerve Stimulation (VNS) offers new hope for epilepsy patients. Get personalised advice on its indications & advantages from expert neurologists at IBS Hospital today. Book your appointment now!

FAQs

Q1: How long does it take to recover after surgery with a vagus nerve stimulation device?
A: After the device is implanted, you can resume your regular activities 48 hours later. You don't need to take out your sutures since they absorb themselves.

Q2: Does every vagus nerve stimulator (VNS) device have an implant?
A: No. Many external VNS devices are available. These external devices are unable to match the requirements of voltages and frequencies that implanted devices can do. They generate electrical signals that have to reach the brain stem via many layers including neck muscles and skin, making them less precise.

Q3: Is VNS a cure for epilepsy or depression?
A: No, VNS is not a cure. However, it can help manage symptoms and improve quality of life, especially for patients who don’t respond well to medication.

By -Dr Aaksha Shukla | April 01, 2025 | 9 Min Read