Neurology & Neurosurgery

RNS Device Can Reduce Seizures in Children with Epilepsy

Dr. Kathryn B. Lalor is a pediatric neurologist at Children’s of Alabama.

A new procedure that can reduce the number and severity of epileptic seizures in children is now available at Children’s of Alabama. The NeuroPace RNS®, or responsive neurosurgical stimulation, is a small device about the size of a matchbox. When placed inside the skull with two wires attached to the brain surface and/or inside the brain, it monitors and responds to brain signals, often short-circuiting a seizure before it begins. It’s been approved for use in adults since 2013, but with recent studies on its safety and effectiveness in children, more centers like Children’s are now offering it “off label” to patients whose seizures don’t respond to medication and/or other surgical interventions.

“It’s an adjunctive therapy, meaning we don’t do it as an initial treatment or thinking someone will necessarily be cured, although that is always our goal,” pediatric neurologist Kathryn B. Lalor, M.D., said. In a multicenter study of 17 patients under age 18, the average number of seizures fell 54.4% over the 1.7-year follow-up. Most patients also experienced less intense, shorter or less frequent seizures. One patient became seizure-free, although four showed no improvement.[1]

The device wouldn’t be a first step in managing seizures, Lalor said, because it’s surgical. “We would only undertake it if we know the seizures can’t be controlled with medications alone,” she said. It also has advantages over medications, including fewer, if any, long-term side effects. One major benefit of the device is that it seamlessly uploads data on its activity to a database clinicians can access, enabling them to track and measure seizures objectively.

“Right now, we know about seizures we witness,” Lalor said. “But there are silent seizures or ones that happen during sleep or when no one is around.” Better data enables doctors to ensure they’re treating all the seizures because even silent seizures can have an effect. With this data, she said, the team can remotely adjust the amount of stimulation the device sends and/or change a child’s medication.

While the device is still not FDA-approved for children, Lalor said more insurance companies are covering it, and a growing number of hospitals offer it with successful outcomes. There is also an ongoing multi-center trial—including the University of Alabama at Birmingham—evaluating its use in adolescents ages 12 to 17.

 “We’re excited to be able to offer this,” Lalor said. The team hopes to implant the first device early this year.

[1] Nagahama Y, et al. Real-World Preliminary Experience With Responsive Neurostimulation in Pediatric Epilepsy: A Multicenter Retrospective Observational Study. Neurosurgery. 2020;39(6):997-1004.

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