Vagus Nerve Stimulation (VNS) in Turkey

Vagus nerve stimulation is used along with antiepileptic mediation. Its effect is experienced only after a long period of time.

How Does a Vagus Nerve Stimulator Work?
The vagus nerve stimulator is a computer programmed device. It is implanted under the patient’s skin below the left collar bone. This is connected to the vagus nerve in the left part of the neck. After 4 weeks from the implantation, the stimulator is switched on. It is programmed by the doctor with the help of a portable hand-held computer. The doctor sets the stimulator to give the required amount of stimulation, which varies for different patients. It is usually initiated at a low level and then enhanced to the required level for an individual patient. The common setting of the stimulator is 30 seconds of stimulation per 5 minutes. The stimulator is battery operated and has a validity of maximum 10 years. When the battery life diminishes, the stimulator should be replaced.

The vagus nerve stimulator can be used to provide extra stimulation before or during a seizure. This is done by moving a special magnet over the stimulator that can stop a seizure from occurring, or reduce a seizure that is already occurring. The magnet can be carried by the patient at all times by wearing it on the belt or around the wrist.

How is a Vagus Nerve Stimulation Surgery Performed?
An incision is made on the left side of the patient’s chest, below the collar bone. The stimulator device is implanted in this area under the skin. The implanted stimulator is a round device that usually measures about 1.5 inches (4cm) in diameter, and 10 to 13 mm in thickness. New models of this device may be smaller. A horizontal incision is then made in the lower neck and the wire from the stimulator is coiled around the vagus nerve that lies in the left side of the neck. Stimulation is only provided on the left vagus nerve, as the right vagus nerves helps to control heartbeat. A small bulge may appear on the skin after the stimulator has been implanted.

What are the Necessary Preparations for the Surgery?

• Many tests may be performed on the patient to find out the focal point of the seizures. These tests include
  • Neuroimaging
  • Psychological tests that determine the patient’s cognitive potentials and weaknesses
• The patient will be explained in detail about vagus nerve stimulation.