Thalamus Seizure Detection With a Deep Brain Stimulator System

Seizure Detection With a Deep Brain Stimulation System

The purpose of this study is to determine the feasibility of chronic ambulatory thalamus seizure detection. The sensitivity, specificity, and false alarm rate of thalamus seizure detection will be calculated using recordings from a deep brain stimulation system, assessed relative to concurrent gold-standard video-EEG monitoring collected in the in-patient setting (epilepsy monitoring unit), in 5 patients with drug resistant epilepsy.

Study Overview

• Status: Recruiting
• Conditions: Epilepsy; Seizure
• Intervention / Treatment: Device: Phase 1-Validation of thalamus seizure detection with concurrent video EEG monitoring; Device: Phase 2-DBS Stimulation with Medtronic Percept DBS device-Out Patient

• Study Type: Interventional
• Enrollment (Estimated): 5
• Phase: Not Applicable

Contacts and Locations

• Study Contact: Name: Karla Crockett; Phone Number: 507-538-4880; Email: crockett.karla@mayo.edu

Study Locations

• United States
  • Minnesota
    • Rochester, Minnesota, United States, 55905
      • Recruiting
      • Mayo Clinic in Rochester
      • Principal Investigator: Nicholas M Gregg

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

Participants must meet all of the inclusion criteria to participate in this study:

• 18 years of age and older.
• Implanted with a clinical DBS system for epilepsy with brain recording capabilities (Medtronic Percept™ DBS).
• Subject or legally authorized representative is able to understand study procedures and to comply with them for the entire length of the study.

Exclusion Criteria:

All candidates meeting any of the exclusion criteria at baseline will be excluded from study participation:

• Health status or any clinical conditions (e.g., life expectancy, co-existing disease) that, in the opinion of the site investigator, would pose undue risk to undergo epilepsy monitoring unit evaluation for the purpose of seizure characterization.
• Women will verify not pregnant, and if applicable, have urine pregnancy test.
• Current drug or alcohol use or dependence that, in the opinion of the site investigator, would interfere with adherence to study requirements.
• Inability or unwillingness of individual or legal guardian/representative to give written informed consent.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Basic Science
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: Thalamus seizure detection with a DBS system; Thalamus seizure detection by a DBS system, validated with concurrent in-hospital gold standard video EEG monitoring.

Device: Phase 1-Validation of thalamus seizure detection with concurrent video EEG monitoring; Epilepsy monitoring unit evaluation will follow standard of care practices for seizure characterization, and antiseizure medications may be reduced to facilitate the recording of seizures. Patient clinical management, and video-EEG interpretation will be completed by the clinical epilepsy monitoring unit team which consists of physicians, nurse practitioners, registered nurses, and in-house 24-hour 7-days-per-week EEG technicians. Continuous full-bandwidth thalamus recordings (250 Hz) will be acquired by the research study team using a standard clinician programmer and telemetry module. Hospital monitoring will last up to 4 days.; Device: Phase 2-DBS Stimulation with Medtronic Percept DBS device-Out Patient; Patients will then transition to the ambulatory phase. In the outpatient setting, patients will have constrained ambulatory thalamus recordings using recording parameters determined by Phase 1. DBS treatment stimulation will be programmed in the clinical epilepsy neuromodulation lab using typical high frequency (>50 Hz) stimulation. High frequency stimulation is the conventional approach to DBS for epilepsy, as was used in the pivotal study leading to premarket approval (SANTE study)2 of anterior nucleus of the thalamus (ANT) DBS for focal epilepsy, which is typical for epilepsy DBS practice3, and several studies of DBS for generalized epilepsy4-6, in a sensing friendly electrode configuration. Patients will keep a detailed seizure diary. Ambulatory thalamus recordings by the DBS system and patient reported seizure diaries will be collected during routine clinical DBS programming visits (q3-9 months).

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Thalamic seizure detection in the epilepsy monitoring unit	The sensitivity, specificity, and false alarm rate of thalamus seizure detection will be calculated using recordings from a deep brain stimulation system, assessed relative to concurrent gold-standard video-EEG monitoring collected in the epilepsy monitoring unit, in patients with drug resistant epilepsy.	2 years

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Ambulatory thalamus seizure detection with constrained DBS recordings	The sensitivity, specificity, and false alarm rate of chronic ambualtory thalamus seizure detection will be calculated using constrained local field potential power-in-band recordings from a deep brain stimulation system, assessed relative to patient reported seizure diary.	2 years

Collaborators and Investigators

• Sponsor: Mayo Clinic
• Investigators: Principal Investigator: Nicholas Gregg, Mayo Clinic

Study record dates

Study Major Dates

• Study Start (Estimated): June 1, 2026
• Primary Completion (Estimated): November 1, 2026
• Study Completion (Estimated): May 1, 2027

Study Registration Dates

• First Submitted: November 20, 2024
• First Submitted That Met QC Criteria: November 20, 2024
• First Posted (Actual): November 22, 2024

Study Record Updates

• Last Update Posted (Actual): March 20, 2026
• Last Update Submitted That Met QC Criteria: March 18, 2026
• Last Verified: March 1, 2026

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Brain Diseases; Central Nervous System Diseases; Nervous System Diseases; Epilepsy
• Other Study ID Numbers: 23-012058

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: Yes
• product manufactured in and exported from the U.S.: No