Connectivity Analysis for Investigation of Auditory Impairment in Epilepsy

October 5, 2017 updated by: National Institute on Deafness and Other Communication Disorders (NIDCD)

Background:

  • People with epilepsy often have auditory processing disorders that affect their ability to hear clearly and may cause problems with understanding speech and other kinds of verbal communication. Researchers are interested in developing better ways of studying what parts of the brain are affected by hearing disorders and epilepsy, and they need better clinical tests to measure how individuals process sound. These tests will allow researchers to examine and evaluate the effects of epilepsy and related disorders on speech and communication.
  • A procedure called a magnetoencephalography (MEG) can be used to measure the electrical currents involved in brain activity. Researchers are interested in learning whether MEG can be used to detect differences in the processing of simple sounds in patients with epilepsy, both with and without hearing impairments.

Objectives:

- To measure brain activity in hearing impaired persons with epilepsy and compare the results with those from people with normal hearing and epilepsy as well as people with normal hearing and no epilepsy. This research is performed in collaboration with Johns Hopkins Hospital and epilepsy patients must be candidates for surgery at Johns Hopkins.

Eligibility:

  • Individuals between 18 to 55 years of age who (1) have epilepsy and have hearing impairments, (2) have epilepsy but do not have hearing impairments, or (3) are healthy volunteers who have neither epilepsy nor hearing impairments.
  • Participants with epilepsy must have developed seizures after 10 years of age, and must be candidates for grid implantation surgery at Johns Hopkins Hospital..

Design:

  • This study will require one visit of approximately 4 to 6 hours.
  • Participants will be screened with a full physical examination and medical history, along with a basic hearing test.
  • Participants will have a magnetic resonance imaging (MRI) scan of the brain, followed by a MEG scan to record magnetic field changes produced by brain activity.
  • During MEG recording, participants will be asked to listen to various sounds and make simple responses (pressing a button, moving your hand or speaking) in response to sounds heard through earphones. The MEG procedure should take between 1 and 2 hours.
  • Treatment at NIH is not provided as part of this protocol.

Study Overview

Status

Terminated

Conditions

Detailed Description

Objective: Auditory processing disorders are common in patients with epilepsy and adversely impact verbal communication. The neural bases of auditory disorders remain poorly understood, impeding development of objective clinical tests. The overall goal of this project is to develop an objective clinical measure of auditory processing using computational modeling of functional brain connectivity. To address this goal, we will use novel functional connectivity methods to analyze magnetoencephalographic (MEG) and intracranial electrocorticographic (ECoG) recordings.

Study Population: We will acquire MEG data from 48 patients with intractable epilepsy prior to their undergoing grid electrode placement for neurosurgery evaluation at Johns Hopkins Hospital. ECoG data will be acquired at JHU under an ongoing study. Approximately half the patients will have auditory processing impairments. We will also acquire MEG from 20 healthy control subjects with no auditory processing impairment.

Design: Three planned studies use a within-subject, repeated measures design. The MEG studies will be conducted before patients have subdural electrodes implanted for intracranial mapping. The MEG studies and connectivity analyses will be performed at NIH. The ECoG studies will take place at Johns Hopkins Hospital. Data will be acquired using the same auditory stimuli and tasks for both the MEG and ECoG parts of the study. The same functional connectivity analyses will be performed on the two data sets.

Outcome measures: The main outcome measures will be (1) functional connectivity patterns in intracranial ECoG data that differentiate epilepsy patients with auditory impairments from those without auditory impairments; and (2) corresponding patterns in MEG data. Secondary outcome measures will consist of relationships between the intracranial ECoG connectivity measures and the MEG connectivity measures.

Study Type

Observational

Enrollment (Actual)

24

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Maryland
      • Bethesda, Maryland, United States, 20892
        • National Institutes of Health Clinical Center, 9000 Rockville Pike

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 50 years (Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

  • INCLUSION CRITERIA:

Normal peripheral hearing: pure tone air conduction thresholds less than or equal to 20 dB HL at octave frequencies between 250-8000 Hz for each ear; word recognition scores in quiet greater than or equal to 88% for each ear; normal 226 Hz tympanometry (middle ear peak pressure at 0 plus/minus 100 daPa and peak compensated static compliance of 0.3-1.5 mmho); no history of chronic otitis media, PE tubes, or hearing loss

For those participants with epilepsy - seizure onset age > 10 years

Normal cognitive function (Full-Scale IQ >84)

Absence of any co-morbid neurological disorder

Absence of highly magnetizable metallic implants, including highly magnetizable dental work

A negative urine pregnancy test

For participants with epilepsy scheduled or to-be-scheduled for grid implantation surgery at Johns Hopkins Hospital

EXCLUSION CRITERIA:

Evidence of neurological or psychiatric disorder that would interfere with data interpretation, including cognitive impairment

Presence of a lesion on a previous MRI, except for the following: mesotemporal sclerosis, cortical dysplasia, and dysembryoplastic neuroepithelial tumor.

Presence of highly magnetizable metallic implants, such as pacemakers, aneurysm clips, cochlear implants and shrapnel fragments, including highly magnetizable dental work, or any significant history of exposure to small metallic objects which may have become lodged in the head or neck.

For controls (healthy volunteers) only: history of speech-language disorder

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
The main outcome measures were to be (1) functional connectivity patterns in intracranial ECoG data that differentiate epilepsy patients with auditory impairments from those without auditory impairments; and (2) corresponding patterns in ...
Time Frame: 12-18 months
12-18 months

Secondary Outcome Measures

Outcome Measure
Time Frame
Secondary outcome measures were to consist of relationships between the intracranial ECoG connectivity measures and the MEG connectivity measures.
Time Frame: 12-18 months
12-18 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

National Institute on Deafness and Other Communication Disorders (NIDCD)

Investigators

  • Principal Investigator: Barry Horwitz, Ph.D., National Institute on Deafness and Other Communication Disorders (NIDCD)

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

September 10, 2010

Study Completion

April 4, 2017

Study Registration Dates

First Submitted

September 29, 2010

First Submitted That Met QC Criteria

September 29, 2010

First Posted (Estimate)

September 30, 2010

Study Record Updates

Last Update Posted (Actual)

October 6, 2017

Last Update Submitted That Met QC Criteria

October 5, 2017

Last Verified

April 4, 2017

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 100211
  • 10-DC-0211

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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