Concurrent electroencephalography (EEG) and new tripolar EEG (tEEG) will be recorded from adult and pediatric patients. In some patients stereo EEG (sEEG) will also be recorded concurrently.
This study is a prospective observational study of the clinical utility (usability + accuracy) and safety of a novel EEG diagnostic device, the Tripolar Concentric Ring Electrode (TCE), that will be used to record the tripolar electroencephalogram (tEEG). The major objectives of the proposed studies will be to compare the recording qualities of the standard scalp EEG and intracranial stereo-EEG (sEEG), in preparation for obtaining FDA clearance for the TCRE and the tEEG technique. tEEG resolves the fundamental drawbacks of conventional EEG, providing significant improvement in signal fidelity, spatial resolution, and registering of higher frequency brain activities. In this project, a comparison of the safety, ease of use, and accuracy of the TCRE device to standard EEG and intracranial sEEG recordings in patients with epilepsy will be performed. An overview of the proposed studies are as follows: Milestone 1: Simultaneous tEEG and EEG will be recorded in the outpatient clinical EEG lab. Per recording, tEEG and gold standard scalp EEG will be compared in 30-minute studies, examining a) usability (i.e., ease of application, time for electrode application, and subject ratings of comfort), b) EEG data quality, and c) accuracy of blinded analysis of common EEG patterns, including epileptiform activity. Milestone 2: Data collected will be analyzed in Milestone 2, to assess the ability of tEEG to suppress commonly encountered EEG artifacts, by comparing blinded analysis of tEEG to the gold standard scalp EEG. Milestone 3: Simultaneous tEEG and EEG will be collected in the inpatient epilepsy monitoring unit. It is anticipated that recordings will last 24-120 hours. From these data, a comparison of the sensitivity and accuracy of tEEG and scalp EEG for detection of seizures and high-frequency oscillations (HFOs) will be performed in long-term (24 hours to 120 hours) studies in subjects undergoing continuous video-EEG monitoring in the Epilepsy Monitoring Unit. Milestone 4: A comparison of the accuracy of tEEG, to gold standard intracranial sEEG for seizure and high frequency oscillation (HFO) localization, will be performed in patients undergoing invasive diagnostic evaluation for epilepsy surgery. In all instances, tEEG and EEG data will be interpreted by board-certified clinical neurophysiologists. This project is a collaborative project where data will be collected separately from pediatric and adult participants. The project leadership team are; study PI, Dr. Walter Besio from CREmedical, Boston Children's Hospital site PI, Dr. Alexander Rotenberg, and Barrow Neurological Institute (Phoenix, AZ) site PI, Dr. Susan Herman.
Study Type
OBSERVATIONAL
Enrollment
90
We will record physiological signals with the tripolar electroencephalography
Barrow Neurological Institute Dignity Health dba St. Joseph's Hospital and Medical Center
Phoenix, Arizona, United States
RECRUITINGBoston Children's Hospital
Boston, Massachusetts, United States
RECRUITINGTechnical and diagnostic accuracy
1. Establish the technical accuracy of tEEG (ability to record waveforms accurately and reproducibly in clinical conditions in comparison to conventional EEG). 2. Establish the diagnostic accuracy of tEEG compared to conventional EEG (combination of improved artifact reduction, better interrater agreement for interictal epileptiform activity, and earlier identification of ictal patterns), as determined by blinded expert EEG readers.
Time frame: up to 10 days
Scalp integrity
Post-EEG: Skin condition will be scored on a 0-6 point scale reflecting erythema and pressure ulcer presence/severity, where 0 = no erythema, 1 = minimal erythema, 2 = moderate erythema with sharply defined borders, 3 = intense erythema with or without edema, 4 = intense erythema with edema and blistering/erosion, 5 = full-thickness tissue loss with exposure of subcutaneous fat but no visible bone, tendon, or muscles, and 6 = full-thickness ulcers with exposure of muscle, tendons, or bones. Scores less than 4 will be considered safe.
Time frame: up to 10 days
Tolerability of tripolar concentric ring electrode electroencephalography
Subjects will complete a questionnaire rating their comfort with EEG placement, recording, and removal. The Wong-Baker FACES Pain Rating Scale will be used for 6 questions: 1. How much discomfort did you feel during placement or adjustment of the EEG electrodes? 2. How much discomfort did you feel at the electrode sites during recording of the EEG? 3. How much itching did you feel at the electrode sites during recording of the EEG? 4. How much headache did you feel during recording of the EEG? 5. How much neck discomfort did you feel during recording of the EEG? 6. How much discomfort did you feel at the electrode sites after EEG electrodes were removed? 0 = no pain 1-3 = mild pain 4-6 = moderate to severe pain 7-9 = very severe pain 10 = worst pain possible Statistical analysis will be performed to determine if the tripolar concentric ring electrodes have a significantly higher pain than conventional electrodes. If so, they are not tolerable.
Time frame: up to 10 days
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Recording of high frequency oscillations
Each HFO candidate event will be marked by an automated HFO detection algorithm. The Readers will then be asked to visually rate candidate HFO events. The Readers will determine "Morphology of Interictal Findings", the readers can select "Epileptiform interictal activity" or "Ictal EEG activity" and HFO if it is a valid event. For candidate events contaminated by artifacts, e.g. events co-occurring with muscle or electrode artifacts in the unfiltered EEG, they will be rated as "Recording is not interpretable", "Recording of reduced diagnostic value", or "Does not interfere with the interpretation of the recording". A statistical comparison will be made between standard EEG and tEEG results to determine which, if either, records HFOs.
Time frame: up to 10 days
Seizure onset zone localization
Readers will determine the onset and offset of all seizures as well as the maximal extent of seizure propagation: generalized (\>8 channels), hemispheric (5-8 channels), or focal (≤4 channels). A seizure is defined as the first unequivocal ictal EEG change from background leading to a clear seizure discharge, without return to background activity. Readers will also mark any rhythmic or periodic patterns detected. A gold standard seizure will be defined as a seizure marked by \>=4 readers with \>=50% overlap in seizure duration
Time frame: up to 10 days