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Related Concept Videos

Seizures: Classification01:13

Seizures: Classification

Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
Seizures are typically classified into two main categories: focal and generalized seizures.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:
Seizures l: Introduction01:20

Seizures l: Introduction

Understanding seizures and epilepsy relies on key definitions that help in recognizing, classifying, and managing these disorders. These definitions provide a framework for recognizing, classifying, and managing seizure disorders.DefinitionsA seizure is a sudden, abnormal burst of electrical activity in the brain that can cause changes in awareness, movement, sensation, or behavior, depending on the area involved. Epilepsy is a chronic condition characterized by recurrent, unprovoked seizures,...

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Related Experiment Video

Updated: Jun 18, 2026

Stereo-Electro-Encephalo-Graphy SEEG With Robotic Assistance in the Presurgical Evaluation of Medical Refractory Epilepsy: A Technical Note
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Characterizing Seizure-Onset Patterns With the Responsive Neurostimulation System.

Zulfi Haneef1,2, Alexandra Celine Vallera2, Sameera Vedantam2

  • 1Neurology Care Line, Virginia Medical Center, Houston, Texas, U.S.A.

Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society
|June 25, 2024
PubMed
Summary
This summary is machine-generated.

Responsive neurostimulation system (RNS) seizure-onset patterns (SOPs) are similar to intracranial EEG (IC-EEG) patterns. RNS efficacy does not depend on the specific SOP, suggesting it is effective for all seizure types.

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Area of Science:

  • Neuroscience
  • Neurology
  • Biomedical Engineering

Background:

  • Responsive neurostimulation (RNS) delivers electrical stimulation to mitigate seizures based on detected epileptiform patterns.
  • Seizure-onset patterns (SOPs) in intracranial EEG (IC-EEG) correlate with seizure outcomes, but their role in RNS therapy is not well understood.

Purpose of the Study:

  • To characterize common SOPs observed during RNS therapy.
  • To determine if specific SOPs correlate with seizure reduction outcomes in patients using RNS.

Main Methods:

  • Analysis of long-episode electrocorticograms from 40 patients with RNS implants.
  • Classification of seizure characteristics into eight previously described IC-EEG patterns.
  • Correlation analysis between SOP types and a ≥50% improvement in reported seizure counts.

Main Results:

  • Low-voltage fast activity was the most frequent SOP observed across 263 analyzed episodes.
  • The distribution of RNS SOPs did not differ significantly from those previously reported in IC-EEG literature (P = 0.98).
  • No statistically significant correlation was found between any specific SOP and favorable seizure reduction outcomes (P = 0.997).

Conclusions:

  • RNS SOPs resemble IC-EEG SOPs, indicating potentially similar prognostic and therapeutic value.
  • The efficacy of RNS appears independent of the patient's specific SOP.
  • Further research into stimulation parameters tailored to SOPs is needed for personalized neurostimulation.