Before surgery, you will undergo diagnostic tests to pinpoint where seizures originate in your brain. The surgical team will use the results to determine how many leads to use and where to place them in the brain.
The implantation procedure generally takes three to four hours. The surgeon will make at least one incision in the scalp and skull to place the neurostimulator and leads. The incisions to place the leads are usually about the size of a quarter but may be larger. The neurostimulator is usually implanted on the side and toward the back of the head.
The device is turned on in the operating room and initially programmed only to record brain activity, without delivering electrical stimulation. The device will be programmed to deliver responsive stimulation in a follow-up visit to the center.
Most patients spend one night in the hospital and are discharged the following day.
About 10 to 14 days after surgery, you will visit the Epilepsy Center to check how your incisions are healing and how many seizures have been recorded. Your doctor will then program the device to deliver stimulation when abnormal brain activity is detected. The neurostimulator will also continue to collect data on your brain activity.
Most patients don't feel the electrical pulses. If you do experience head pain or a brief tingling sensation in your scalp, please notify your doctor so the settings on the neurostimulator can be adjusted.
You will return to the Epilepsy Center four to six weeks after surgery, and every three months thereafter, to monitor how the RNS is working. It can take as long as a year to see the full effects of RNS, and the frequency of seizures appears to continue to decline over time.
You will be given a remote monitor that allows you to collect data from the neurostimulator and send it to your doctor. Your doctor will use the data to fine-tune the system's settings at future visits. The system also includes a magnet that instructs the neurostimulator to record brain activity when you swipe it over the implant site during a seizure. You can also use the magnet to temporarily stop the stimulation.
You will receive a wallet-sized medical implant identification card. Please carry this card with you at all times. You will need to show it when going through security systems at airports or elsewhere.
After the device is implanted, you must avoid certain medical treatments that could cause energy to travel through the device to the brain, leading to brain injury or death. These include MRI, diathermy, electroconvulsive therapy and transcranial magnetic stimulation.
The neurostimulator's battery generally lasts about two-and-a-half to four years. When your battery is low, you will need to have the neurostimulator surgically replaced. Unless the leads also need to be replaced, the new neurostimulator will be connected to the same leads.
For more information, please contact one of our epilepsy nurse specialists:
Maritza Lopez, (415) 353-2134
Mariann Ward, (415) 353-2347