Neuropathology of Spasmodic Dysphonia
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|ClinicalTrials.gov Identifier: NCT00118586|
Recruitment Status : Active, not recruiting
First Posted : July 11, 2005
Last Update Posted : October 22, 2020
This study will look for abnormalities in a brain of persons affected with spasmodic dysphonia, a form of movement disorder that involves involuntary "spasms" of the muscles in the vocal folds causing breaks of speech and affecting voice quality. The causes of this disorder are not known. The study will compare results of magnetic resonance imaging (MRI) in people with spasmodic dysphonia and in healthy volunteers.
People with adductor or abductor spasmodic dysphonia and healthy volunteers may be eligible for this study. Candidates are screened with a medical history, physical examination, and a test called nasolaryngoscopy. For this test, the inside of the subject's nose is sprayed with a decongestant, and a small, flexible tube called a nasolaryngoscope is passed through the nose to the back of the throat to allow examination of the larynx (voice box). During this procedure, the subject is asked to perform tasks such as talking, singing, whistling, and saying prolonged vowels. The nasolaryngoscope is connected to a camera to record the movements of the vocal folds during these tasks.
Eligible participants then undergo MRI of the brain. MRI uses a strong magnetic field and radio waves instead of x-rays to obtain images of body organs and tissues. For this test, the subject lies on a table that slides into the MRI scanner, a narrow metal cylinder, wearing ear plugs to muffle loud knocking sound that occurs during the scan. During MRI anatomical images of the brain are obtained. Subject may be asked to participate in up to two scanning sessions. Each session takes about 1-1/2 hours.
Participants may also be asked to volunteer for a brain donation program which is optional. Information gained from donated tissue may lead to better treatments and potential cures for spasmodic dysphonia.
|Condition or disease|
|Voice Disorders Spasmodic Dysphonia Healthy Movement Disorder Focal Dystonia|
|Study Type :||Observational|
|Actual Enrollment :||97 participants|
|Official Title:||Neuropathological Basis of Spasmodic Dysphonia and Related Voice Disorders|
|Actual Study Start Date :||July 14, 2005|
Muscle tension dysphonia
Increased phonatory muscle tension in the paralaryngeal and suprahyoid muscles onpalpation
Normal vocal function refers to normal voice quality with a negative history of voice orlaryngeal disorders
A diagnosis of adductor or abductor SD will be based on voice testing and fiberoptic nasolaryngoscopy conducted during the initial interview
Vocal tremor during vocalization that primarily involves laryngeal structures
- Premortem imaging techniques will determine if there are differences in the brain anatomy of patients with SD compared to MTD, VT andto research volunteers [ Time Frame: on going ]Premortem imaging techniques will determine if there are differences in the brain anatomy of patients with SD compared to MTD, VT and to research volunteers:a) Volumetric reconstruction of gray matter regions involved in voice production;b) Visualization of the white matter tracts between brain regions of interest.
- Postmortem MRI will identify discrepancies between premortem and postmortem brains of the same persons with SD in comparisons to MTD, VT and to research volunteers [ Time Frame: after postmortem MRI ]Postmortem MRI will identify discrepancies between premortem and postmortem brains of the same persons with SD in comparisons to MTD, VT and to research volunteers
- Microscopic examination of brain sections will determine whether abnormalities can be found in the cortical and subcortical regions involved in voice production in persons with SD that differ from patients with MTD and VT [ Time Frame: Postmortem ]Microscopic examination of brain sections will determine whether abnormalities can be found in the cortical and subcortical regions involved in voice production in persons with SD that differ from patients with MTD and VT
- Microscopic examination of the larynx will determine distribution of motor and sensory nerve endings in persons with SD and in patients with MTD and VT and controls [ Time Frame: Postmortem ]Microscopic examination of the larynx will determine distribution of motor and sensory nerve endings in persons with SD and in patients with MTD and VT and controls
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00118586
|United States, Maryland|
|National Institutes of Health Clinical Center, 9000 Rockville Pike|
|Bethesda, Maryland, United States, 20892|
|Principal Investigator:||Sandra B Martin||National Institute of Neurological Disorders and Stroke (NINDS)|