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Protocol Details

Clinical and Molecular Analysis of Enlarged Vestibular Aqueducts

This study is currently recruiting participants.

Summary | Eligibility | Citations | Contacts




Sponsoring Institute

National Institute on Deafness and Other Communication Disorders (NIDCD)

Recruitment Detail

Type: Participants currently recruited/enrolled
Gender: Male & Female
Min Age: 0
Max Age: 99

Referral Letter Required


Population Exclusion(s)


Special Instructions

Currently Not Provided



Recruitment Keyword(s)

Hearing Impairment;
Nonsyndromic Hereditary Hearing Impairment;
Inner Ear;
Enlarged Vestibular Aqueducts;


Sensorineural Hearing Loss;
Cytomegalovirus Infection

Investigational Drug(s)


Investigational Device(s)




Supporting Site

National Institute on Deafness and Other Communication Disorders

This study will try to identify and understand the genetic factors that lead to an inner ear malformation called "enlarged vestibular aqueducts", that can be associated with hearing loss.

Patients with sensorineural hearing loss with or without inner ear malformations and their parents and siblings may be eligible for this study. Participants and their immediate family members, may undergo some or all of the following tests and procedures:

- Medical and family history, including questions about hearing, balance and other ear-related issues, and review of medical records.

- Routine physical examination.

- Blood draw or buccal swab (brushing inside the cheek to collect cells) - Tissue is collected for DNA analysis to look for changes in genes that may be related to hearing loss.

- Hearing tests - The subject listens for tones emitted through a small earphone.

- Balance test (VEMP) to see if balance functions of the inner ear are associated with the hearing loss Electrodes will be placed behind your ear and at the base of your neck. From a reclining position, you will be asked to raise your head while clicking sounds are played into your ears. - Ultrasound tests - An inner ear malformation called EVA (enlargement of the vestibular aqueduct) indicates that a genetic disorder called Pendred syndrome may be the cause. Because thyroid abnormalities are also associated with Pendred syndrome, an ultrasound examination of the thyroid gland may be done.

- Computed tomography (CT) and magnetic resonance imaging (MRI) scans - These tests show the structure of the inner ear. For CT, the subject lies still for a short time while X-ray images are obtained. For MRI, the patient lies on a stretcher that is moved into a cylindrical machine with a strong magnetic field. The magnetic field and radio waves produce images of the inner ear. The radio waves cause loud thumping noises that can be muffled by the use of earplugs.

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Subjects must have or be a family member of a participant with known or non-syndromic SNHL associated with EVA or have evidence of other findings that suggest that EVA might be part of a novel phenotype

There must be at least two participating affected family members.

Adults must be able to provide informed consent

Minors must have a parent or guardian able to provide consent

Age between 0-99.


Subjects with known exposure to physical or chemical teratogens in utero that could account for their inner ear malformations such as thalidomide or radiation

Any hearing loss that is associated with symptoms which meet the criteria of already known syndromes, such as, branchio-oto-renal (BOR) syndrome, which comprises system malformations and branchial cleft abnormalities and is caused by heterozygous mutations in the EYA1 gene.

Previous genetic testing identifying two pathogenic mutant alleles of SLC26A4.

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Mondini dysplasia and congenital cytomegalovirus infection

Longitudinal investigation of hearing disorders in children with congenital cytomegalovirus

Pendred syndrome is caused by mutations in a putative sulphate transporter gene (PDS)

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Principal Investigator

Referral Contact

For more information:

Andrew J. Griffith, M.D.
National Institute on Deafness and Other Communication Disorders (NIDCD)
BG 35A RM GF103
(301) 402-2829

Jessica S. Ratay
National Institute on Deafness and Other Communication Disorders (NIDCD)
National Institutes of Health
Building 35
Room 1F233
35 Convent Drive
Bethesda, Maryland 20892
(301) 435-1574

Office of Patient Recruitment
National Institutes of Health Clinical Center (CC)
Building 61, 10 Cloister Court
Bethesda, Maryland 20892
Toll Free: 1-800-411-1222
Local Phone: 301-451-4383
TTY: 1-866-411-1010

Clinical Trials Number:


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