Brain-Responsive Device Cuts Seizures Over Three Years
⚠️ SUDEP: If you have concerns, speak with your clinician about risk and safety planning.
Source: Neurology
Summary
This study looked at a brain device called the RNS System in adults with drug-resistant focal epilepsy, meaning seizures kept happening despite medicine. It was a real-world follow-up study required after the device was approved. Across 32 epilepsy centers in the United States, 324 adults were implanted with the device, and 271 were followed for 3 years.
The main finding was that seizures became much less frequent over time. The middle result was a 62% drop in seizures at 6 months and an 82% drop at 3 years. By 3 years, 41% of patients had their seizures reduced by at least 90%, about 43% had at least one seizure-free stretch lasting 6 months or longer, and 22% were seizure-free for 12 months or more. Results were similar for different seizure starting points in the brain. No serious side effects caused by the stimulation itself were reported.
This matters because it suggests the device worked well and appeared safe in everyday medical care, not just in earlier research trials. In fact, seizure results were better than in the original approval studies, possibly because doctors have gotten better at setting up the device. But there are limits: this was not a randomized trial, everyone knew they were getting the treatment, and the full safety review is still planned for 5 years, so longer-term results are still being studied.
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